The concept of „Sustainability‟ has become as major concern and it used by consumers and corporations to convey the concept of taking care of the environment. Environmental concern has led to sustainable consumption in a variety of product categories, such as electricity, textiles, apparel, food, and grocery products (Chan, 2001; Harrison, Newholm, & Shaw, 2005; Vermeir & Verbeke, 2006a, 2006b). Interest of the negative environmental impacts are rapidly increasing in present fashion business and consumer behavior has become a rising concern of the consumption and fashion supply chain to apply sustainable consumption (Birtwistle & Moore, 2007; Fineman, 2001). The environmental and social concern recognized in fashion industry from 1990‟s. However, the complexity of conceptual definition of sustainability and ecologically responsible consumer generates different and mistaken perception to consumer. In addition, in fashion industry, the terms of „eco-fashion‟, „environmentally friendly fashion‟,„green fashion‟, „ethical fashion‟, and „sustainable fashion‟ are frequently used interchangeably to describe the same concept. These interchangeable terminology is leading to confusion of the readers by the non-unified terminology (Choi et al., 2012). Also, consumers seem to have narrow scope and little understanding of sustainable fashion. In general, consumers focuses on environmental aspect not the wide-range of complexity of environment, social, and economical concern (Cervellon, Hjerth, Ricard, & Carey, 2010). The growing number of fashion brands are leveraging on green branding initiatives. Green marketing is increasing rapidly in corporate aspects and for a consumer perspective, global consumers are recognizing a personal accountability to take responsibility for social and environmental issues. Despite the fact many of individuals‟ willingness to purchase green products has increased in the last few years, however, there is limited studies suggest that purchase of green or sustainable products. Consumer research on sustainable fashion has mainly focused on consumer behaviors towards sustainable fashion products (SFPs); however, relevant studies that examined the whole process of the predicting proenvironmental behavior cross nationally value and the eWOM are still scarce. The purposes of research model are 1) to identify the determinants of eWOM intention on consumers' purchase intentions, 2) to examine the information adoption process as precursors of purchase intention of sustainable fashion, and 3) to testify different message types effects to information adoption process.

This study focuses on exploring how to close attitude-behavior gap of consumers with regards to both recycled and upcycled fashion products. Specifically, this study is to explain the purchase gap between purchase intention and purchase experience of these sustainable products. Although many consumers had positive attitudes toward sustainable products, they often ended up not purchasing them. Factors including perceived values, risks, environmental concern, perceived consumer effectiveness, subjective norms, and demographic variables were examined to understand the discrepancy. The results indicate that antecedents of purchase intention were different from those of purchase experience and that influencing factors for recycled products were different from those for upcycled products. This study provides insights into understanding consumers and developing effective strategies to encourage desirable behaviors.

Sustainability is currently regarded as an imperative business goal by multiple stakeholders, comprising investors, customers, and policymakers (Nidumolu, Prahalad, & Rangaswami, 2009; Sheth, Sethia, & Srinivas, 2011). In particular, how effectively the fashion industry deals with the challenges of sustainability will define its success for eras to come. This study focuses on how social power, parasocial interaction, and social capital work for purchase intention of sustainable fashion products in the fashion YouTube context. Specifically, the study investigates the effects of social power on parasocial interaction, the effects of parasocial interaction on social capital, and the effects of social capital on purchase intention for sustainable fashion products and the implications for sustainable fashion marketing and management. Theoretical Framework This study defines social power as types of power that can be employed to exert influence on others. The five social power bases (French & Raven, 1959) are discussed in terms of perceived influence: Expert power refers to someone who is perceived to be an expert, to have expert knowledge, or to possess special information. Legitimate power relates to someone who is perceived to have a legitimate right to impose behavioral requirements. Referent power is associated with someone who is personally identified. Reward power refers to someone who is perceived to have ability and coercive power to someone who is perceived to have the capability to confer punishment. Parasocial interaction concerns the relationship between media personalities and media users (Frederick, Lim, Clavio, & Walsh, 2012; Horton & Wohl, 1956; Jin & Park, 2009). Parasocial interaction can be defined as “immediate, personal, and reciprocal, but these qualities are illusory and presumably not shared by the speaker” (Horton & Strauss, 1957, p. 580; Jin & Park, 2009). Parasocial interaction theory focuses on the way audiences interact, relate to, and develop relationships with a celebrity (Jin & Park, 2009; Lee & Watkins, 2016). Audiences create a strong bond and intimacy with a celebrity while viewing media channels such as TV programs and social interactive media where audiences feel closer to the celebrity (Kassing & Sanderson, 2009; Lee & Watkins, 2016). Social capital refers to “the aggregate of the actual or potential resources linked to possession of a durable network of more or less institutionalized relationships” (Bourdieu, 1985, p. 248). Social capital involves the relationship between providing access to resources possessed by the associates and the nature and amount of those resources (Portes, 1998). Social capital can be clarified as an intangible force that helps to bind society together by transforming self-seeking individuals into members of a community with shared interests, shared assumptions about social relations, and a sense of the common good (Etzioni, 1996). Sustainability refers to three dimensions: economic, environmental, and social (Sheth, Sethia, & Srinivas, 2011). Sustainability transforms into a triple bottom line responsibility, with the inference that assessment of business outcomes should be based not only on economic performance, but also on the environmental and social impact. Environmental and social demands from various stakeholders contribute to the pressure for businesses to reflect sustainability. Thus, sustainable marketing practices are defined from economic, environmental, and social perspectives. In this study, effective sustainability measurements involve purchase intention for sustainable products especially emphasizing environmental and social performance. Focused on the effects of social power on parasocial interaction and the effects of parasocial interaction on social capital and purchase intention for sustainable products, this study tests the following hypotheses: H1. Social power (expert, referent, legitimate, and reward) positively influences parasocial interaction. H2. Parasocial interaction positively influences social capital (bonding and bridging). H3. Social capital positively influences purchase intention for sustainable fashion products (environmentally and socially sustainable fashion products). Methods This study used a survey to investigate key questions about the associations among social power, parasocial interaction, social capital, and purchase intention for sustainable fashion products. A total of 230 fashion YouTube users recruited from South Korea participated in the survey. Of the 230 participants, 40 were men (17.4%) and 190 were women (82.6%), with ages ranging from 20 to 39 (mean = 29.43 years). The social power of the fashion YouTuber (e.g., vlogger) was measured through an existing social power scale including expert, referent, legitimate, and reward measures that elicited user responses to 14 items (Goodrich & Mangleburg, 2010). Parasocial interaction was measured on the basis of user responses to six items on an existing 5- point scale that assessed parasocial interaction (Jin & Park, 2009). This study measured social capital on a 5-point Likert scale (1 = strongly disagree; 5 = strongly agree), which was adapted from an existing Internet social capital scale (Williams, 2006). Purchase intention was measured using three 7-point semantic differential scales (likely/unlikely, probable/improbable, possible/impossible; MacKenzie, Lutz, & Belch, 1986) after informing participants that they might be purchasing environmentally and socially sustainable products. Results The overall goodness-of-fit for this measurement model was acceptable (Chi-square 1236.138, df = 680, p <0.001, chi/df=1.818, TLI = 0.900, CFI = 0.913, RMSEA = 0.060). The reliability coefficients of all 14 social power measures including expert, referent, legitimate, and reward were 0.871, 0.782, 0.657, and 0.865, respectively. The reliability coefficient of all six parasocial interaction measures was 0.873. The reliability coefficients of all social capital measures were 0.684 for bonding factors and 0.899 for bridging factors. The reliability coefficients of purchase intention of environmentally and socially sustainable product measures were 0.921 and 0.947, respectively. The coefficients indicate acceptable reliability of the measures. This study used partial least squares (PLS) for structural equation modeling, which has good statistical power for samples. Social power, including referent (β = 0.018, p < 0.05) and reward (β = 0.359, p < 0.001), showed statistically positive effects on parasocial interaction. The results partially supported H1. Parasocial interaction showed statistically positive effects on social capital, the bonding factor (β = 0.578, p < 0.001), and the bridging factor (β = 0.651, p < 0.001). Thus, the results supported H2. For parasocial capital, bridging showed statistically positive effects on purchase intention of environmentally (β = 0.233, p < 0.01) and socially (β = 0.284, p < 0.01) sustainable products. Thus, the results partially supported H3 (see Table 1, Figure 1). Discussion This study contributes to clarifying the concept of social capital and determining the relationships between social capital and purchase intention for sustainable fashion products. This study contributes to the theoretical foundation and implications of social capital and sustainability. Specifically, social power, including referent and reward, positively influences parasocial interaction. Parasocial interaction has positive effects on social capital. In turn, social capital positively influences purchase intention for sustainable fashion products. This is the first study on the effects of social capital on purchase intention for sustainable fashion products in the fashion YouTube context. This study suggests that social capital is a strong influential variable for purchase intention regarding sustainable fashion products. Thus, fashion marketers should consider social capital management in the fashion YouTube context while tailoring their brand communications to enhance their sustainable marketing and management.

Despite the consumer's interest in sustainable fashion and the sustainable fashion phenomenon in the fashion business being a serious issue for our society, only a limited number of studies focus on investigating the consumer's perceived value of sustainable fashion. Although eco-friendly consumption has been recognized as one of the major concerns of the fashion business, environmentally prudent consumption has not yet transformed into purchasing behavior. However, fashion companies try to offer many seasonal collections due to the fast fashion trends to meet the consumer's needs. Such trends have brought about an enormous amount of apparel waste, negative environmental impacts and serious questions about social issues. In addition, today’s fashion consumers appear to have a narrow point of view on sustainable/green fashion that focuses mainly on organic clothing, and avoids or shows no interest in the wider scope of sustainability encompassing environmental, social and economic concerns (Cervellon, Hjerth, Richard, & Carey, 2010). Increasing the consumption of sustainable fashion necessitates research into how fashion consumers make purchasing decisions. Therefore, the information and value of sustainable fashion need to be diffused by fashion consumers. Hethom and Ulasewicz (2008) stated that the consumer acts as a major stakeholder with the greatest impact on the development of a sustainable industry. Furthermore, it is necessary to examine the consumer's purchase decision-making process for sustainable fashion products in academia. According to previous studies, the awareness of sustainability issues is also growing due to the environmental impacts. However, this awareness has not yet affected apparel purchasing behavior and actual purchasing (Kim & Damhorst, 1998). In order to affect the behavior of fashion consumers and expand sustainable fashion in today's marketplace, it is essential to identify the influencing factors in purchase decision-making process for sustainable fashion products.

In the fashion industry, designers and researchers have proposed various sustainable fashion products (i.e., sustainability in product development), and retailers have also created many sustainable business practices (i.e., sustainability in distribution). However, according to the previous researches, even though the industry have offered a variety of sustainable designs and retail offers, consumers did not show a positive purchase behavior on the sustainable products. Currently, the gap exists between industry offers for sustainability and consumers’ expectation/acceptance of those offers. This result supports that there are other aspects than environmental protection aspect of the sustainable fashion products that need to be improved and/or be emphasized on to make consumers feel confident in purchasing. To examine consumers’ purchase behavior changes on sustainable fashion products, this study will measure consumers’ equity of sustainability on existing sustainable fashion products with three criteria of sustainable designs proposed by Day and Townsend (1993), which are socially equitable, economically viable, and environmentally benign. Then, consumers’ purchase intention for sustainable fashion products will be measured. The result will show the sustainable fashion product types that currently satisfy consumers so that the industry can concentrate on and develop the types further. In addition, this study will explore the impact of well-known brand names and cause-related marketing whether they would improve consumers’ purchase intention towards sustainable fashion products. No research has studied these two variables for sustainable fashion products as well as the equity of sustainability. Finally, different benefit sought groups will be tested whether they show different acceptance/preference and impact of brand names and cause-related marketing on the sustainable fashion products so that companies can set the appropriate strategies based on their target market’s benefit sought. PROPOSED MODEL AND HYPOTHESES Based on previous researches, the authors propose a new model shown in the figure 1, and the hypotheses are developed based on the model. H1. Significant differences in equity of sustainability, purchase intention before and after cause-related marketing and the relationships in the model. H1-1. Consumers will differently evaluate equity of sustainability of each sustainable fashion product type. H1-2. Consumers will have different purchase intention on each sustainable fashion product type. H1-3. Consumers will have different purchase intention on each sustainable fashion product type after cause-related marketing. H1-4. Equity of sustainability will significantly influence on purchase intention in all sustainable fashion product types. H1-5. Cause-related marketing will significantly improve purchase intention in all sustainable fashion product types. H2. Significantly different results in H1 between benefit sought groups. H2-1. Benefit sought groups will have significantly different equity of sustainability on all sustainable fashion product types. H2-2. Benefit sought groups will have significantly different purchase intention on all sustainable fashion product types. H2-3. Benefit sought groups will have significantly different purchase intention on all sustainable fashion product types after cause-related marketing. H2-4. Benefit sought groups will show a different relationship between equity of sustainability and purchase intention in all sustainable fashion product types. H2-5. Benefit sought groups will show a different influence of cause-related marketing on purchase intention in all sustainable fashion product types. H3. Significantly different results in H1 after adding well-known brand names on sustainable fashion product types. H3-1. Equity of sustainability will be significantly different for all sustainable fashion product types after adding well-known brand names. H3-2. Purchase intention will be significantly different for all sustainable fashion product types after adding well-known brand names. H3-3. Purchase intention after cause-related marketing will be significantly different for all sustainable fashion product types after adding well-known brand names. H3-4. The relationship between equity of sustainability and purchase intention will be different after adding well-known brand names in all sustainable fashion product types. H3-5. The influence of cause-related marketing on purchase intention will be different after adding well-known brand names in all sustainable fashion product types. H4. Different results from H2 after adding well-known brand names. H4-1. The significant difference of equity of sustainability between benefit sought groups will be different after adding well-known brand names in all sustainable fashion product types. H4-2. The significant difference of purchase intention between benefit sought groups will be different after adding well-known brand names in all sustainable fashion product types. H4-3. The significant difference of purchase intention after cause-related marketing between benefit sought groups will be different after adding well-known brand names in all sustainable fashion product types. H4-4. After adding well-known brand names, the result of the relationship between equity of sustainability and purchase intention in each benefit group will be different in all sustainable fashion product types. H4-5. After adding well-known brand names, the result of the relationship between cause-related marketing and purchase intention in each benefit sought group will be different in all sustainable fashion product types. RESEARCH METHOD A simple black dress which is the product silhouette consistently shown through all sustainable fashion product types and relatively low involved when purchasing was selected to minimize the cognitive effort to process/judge the product attributes (Tucker, Rifon, Lee & Reece, 2012). The equity of sustainability is determined as an average score of economic viability, social equity, and environmental responsibility of each sustainable fashion product type. Benefit segments most commonly studied in the previous researches are selected for this study which are price-conscious, fashion-conscious, brand-conscious, convenience-conscious, quality-conscious, self-express, and self-confidence groups. Brand name is a moderator variable to test the brand name effect on participants’ response. Two different versions of questionnaires were distributed. One version shows brand names on the product types, which are selected as reliable brand names from a pretest in terms of quality and credibility, and the other version does not show any brand names on the product types. The reliable brand names are luxury brands such as Ralph Lauren rather than middle to low-priced brands. Both versions include the question for purchase intention before and after cause-related marketing (e.g., “If 10% of this sales is donated to a non-profit organization to preserve our environment, I would buy this item.”). Only female consumers are allowed to participate in the survey because the stimuli are dresses. Surveys were distributed by a commercial survey data collection company. Total 399 surveys were usable (non-brand version, n=190; brand name version, n= 209). The majority of participants are between 25 to 44 years old (22-34 years 49.1%, 35-44 years 16.8%) and has a college degree (college degree 52.6%, graduate school degree 25.8%). RESULTS & CONCLUSIONS From the data analysis (see table 1), non-brand companies would have a benefit by offering transformable products in which consumers feel more value than other sustainable fashion product types. When showing luxury brand names, participants evaluated upcycling products as the highest equity of sustainability and purchase intention after cause-related marketing. The zero waste luxury brand product received the highest purchase intention before cause-related marketing and also received a significantly higher equity of sustainability than the non-brand zero waste product. Therefore, it is recommended for luxury brands to show their sustainability practice on the product through labels, especially showing a zero waste production label. The result in all sustainable fashion product types regardless of brand names showed that the higher sustainability, the higher purchase intention. Thus, again, it is important for companies to educate their sustainability practices (e.g., economic, social and environmental values) to consumers through either promotions or labels on the products. For both non-brand and luxury brand products, promoting a donation or support for community/society (i.e., cause-related marketing) on the product would influence consumers' purchase decision when selling the upcycling, recycling and promotion on fashion products. For example, companies could create/include a symbol of their cause-related marketing or include a symbol of a non-profit organization on the sustainable fashion products. Considering different benefit sought groups, the high fashion involved group scored the variables higher in most sustainable fashion product types in the model than the low fashion involved group did. When companies plan to offer sustainable fashion products, they need to target the high fashion involved group for a better sales outcome. Even though participants perceived that the upcycled product was highly sustainable, they purchased different product types. The high fashion involved group highly intended to purchase the transformable product in the non-brand product types and the animal-free product in luxury brand product types in both before and after cause-related marketing. Luxury brands are the ones typically consume most real animal furs and skins, and this might influenced the participants’ purchase intention. The low fashion involved group were willing to purchase the product with organic materials in both non-brand and luxury brands, but cause-related marketing increased the purchase intention on the most of product types. Companies targeting a low fashion conscious group are suggested developing/promoting organic fashion products and actively promote their community/society involvement. Regardless of benefit sought groups, higher equity of sustainability generated higher purchase intention. Again, companies need to inform/promote their sustainability practices to consumers through products or media to improve sales. The impact of cause-related marketing on the purchase intention was significant for the low fashion involved group in the upcycling, recycling, promotion on the product, zero waste and transformable products regardless of brand names. Therefore, when companies cannot appeal consumers with their brand names, the cause-related marketing plays an important role. The low fashion involved consumers seem to consider the after-purchase impact on the society than product itself when purchasing sustainable fashion products. The cause-related marketing had less impact for the high fashion involved group on their purchase intention than the low fashion involved group; however, the purchase intention of non-brand upcycling and the upcycling, recycling and promotion on the product for luxury brands have significantly improved after cause-related marketing. Companies, especially luxury brand names, need to include cause-related marketing when selling those product targeting the high fashion involved group.