This study aimed to identify changes in upper body measurements and body shape types among women over a 10-year period based on data from the 6th and 8th Size Korea Anthropometric Surveys. The study used regression analysis to explore the relationship between various dimensions, enabling the prediction of different upper body dimensions based on height and waist circumference. The sample consisted of 1,179 women in their 20s who participated in the 6th (2010) and 8th (2020) Size Korea Anthropometric Surveys, with 33 items analyzed. Initially, most items, except those related to height, exhibited larger values in the 8th Survey than in the 6th, suggesting a general increase in the upper body dimensions of females in their 20s over the 10-year period. Subsequent factor analysis revealed three factors crucial for determining the upper body shape of women in this age group. The body shapes were then categorized into four distinct clusters. Regression analysis indicated that both waist circumference and height significantly influence most of the measured items, with waist circumference having a more substantial impact in most models. Through this research, we aim to provide foundational data that reflects the evolving upper body shapes of women in their 20s to enhance clothing production and improve the sizing system.

I.􀀃 Introduction
Ⅱ.􀀃 Background
Ⅲ.􀀃 Research􀀃 Method
    1.􀀎 Study􀀎 data
    2.􀀎 Analysis􀀎 items􀀎 and􀀎 data􀀎 analysis
Ⅳ.􀀃 Results􀀃 and􀀃 Discussion
    1.􀀎 Changes􀀎 in􀀎 upper􀀎 body􀀎 measurements
    2.􀀎 Factor􀀎 analysis􀀎 of􀀎 upper􀀎 body􀀎 measurement
    3.􀀎Classification􀀎of􀀎upper􀀎body􀀎shapes􀀎in􀀎women􀀎in􀀎 their􀀎 20s
    4.􀀎The􀀎impact􀀎of􀀎height􀀎and􀀎waist􀀎girth􀀎on􀀎upper􀀎body􀀎 measurements
Ⅴ.􀀃 Conclusion
References

• Tsz Ki Wong(Master, Dept of Fashion Industry, Ewha Womans University, Korea) | 왕지혜 (이화여자대학교 의류산업학과 석사)
• Chae-Ryung Kwon(Lecturer, Dept of Fashion Industry, Ewha Womans University, Korea) | 권채령 (이화여자대학교 의류산업학과 강사)
• Dong-Eun Kim(Professor, Dept of Fashion Industry, Ewha Womans University, Korea) | 김동은 (이화여자대학교 의류산업학과 교수) Corresponding author