This study analyzed the body measurements of women aged 20–59 using the 8th Size Korea anthropometric data to provide basic data for improving the sizing system of women’s one-piece swimsuits. Mahalanobis distance was calculated using 4 main sizes which are height, bust circumference, waist circumference, and hip circumference. 2,246 subjects were selected as the final sample based on the p<.01 criterion of Mahalanobis distance. A regression analysis was conducted to predict trunk circumference using height and major circumference measurements, aiming to improve the length fit of one-piece swimsuits. The final regression residuals were used for 3-cluster K-means analysis to classify subjects into short-, regular-, and long-torso body types. Body measurement comparisons by body type showed no significant differences in height or major circumference measurements. Conversely, significant differences were found in trunk circumference, vertical trunk length, and waist height at the omphalion. Accordingly, 12 sizes designations representing 3.0% or more in the cross-distribution of torso-length body types and 5-cm bust circumference intervals were selected, with major and supplementary reference body measurements presented for each designation. This study provides useful basic data for developing body-type-specific products and grading criteria by incorporating informing regarding torso-length body types into the conventional bust-based swimsuit sizing system.

Abstract
I. Introduction
Ⅱ. Review of literature
    1. Characteristics of one-piece swimsuits
    2. Current status of swimsuit sizing and fitdiscomfort
    3. Characteristics of the swimwear sizing system
Ⅲ. Research Methods
    1. Selection of research subjects
    2. Classification of body types by torso-length
    3. Selection of production size designations andcalculation of reference body measurements
Ⅳ. Results and Discussion
    1. Body measurement characteristics of thesubjects
    2. Torso-length body type classification byK-means clustering
    3. Selection of production size designations
    4. Reference body measurements by productionsize designation
Ⅴ. Conclusion
References

• Yeo Sun Kang(Professor, Dept. of Fashion Design, Duksung Women’s University, Korea) | 강여선 (덕성여자대학교 의상디자인 교수) Corresponding author