Although they generally undergo less change in somatotype than other age groups, women in their early twenties have postural changes incurred with their inappropriate postures during the growth period. Since such somatotype changes reduce their satisfaction in the fitting of ready-made clothing, the study intends to examine the inadequate postures and life habits of women in their twenties and to analyze their self-recognition and actual conditions of the bad fit of ready-made clothes. A survey questionnaire was conducted on 225 customers and 29 sellers of ready-made clothes. According to the result, it was found that their inappropriate postures had made their back and shoulders undesirably bent and led to their low satisfaction in the fitting of ready-made clothes. Therefore, it is necessary to perform researches for developing renovated design in consideration of their somatotype changes.