Fair trade implies honest wages and eco-friendly products in keeping with the demands of ethical consumerism. Although consumers are presently more interested in fair trade products, it is hard to find aggressive marketing strategies for fair trade fashion products. Therefore, the purpose of this study investigates the effect of consumption propensity on fast and slow fashion goods consumption attitudes and purchase intention on fair trade fashion products. For method of this study, 229 questionnaires were distributed to consumers residing in Seoul, South Korea. The data from the 219 returned usable questionnaires was analyzed by Cronbach’s alpha, factor analysis, regression analysis using SPSS 22.0. The results of this study were as follows: First, consumption propensities of spontaneity, histrionics, and imitative nature in descending order positively affect consumption attitude for fast fashion products. And green consumerism negatively affects consumption attitude for fast fashion products. Second, consumption propensity such as donation & sharing consumerism, ethical consumerism, green consumerism, histrionics, and imitative nature in descending order positively affect consumption attitude for slow fashion products. Third, slow and fast fashion products consumption attitude in descending order positively affect purchase intention on fair trade fashion products. Fourth, consumption propensities such as ethical consumerism, green consumerism, and donation & sharing consumerism in descending order positively affect purchase intention on fair trade fashion products. Therefore fair trade fashion products with various usages and sustainable high quality are promoted by differentiated marketing strategies.