The purpose of this study was to offer basic data to global fashion market by surveying differences between lifestyle of women in Korea and America and their clothing behavior with female consumers in 30s in Korea or America with each other cultural background, comparing/analyzing differences between lifestyle and clothing behavior according to Korea and America and making a close inquiry into an effect of lifestyle on clothing behavior. The results of the study were as follows. First, when the study carried out factor analysis of lifestyle, five factors- outward appearance-oriented, leisure-oriented, family-centered, information-oriented and economy- oriented-were deducted. In outward appearance-oriented lifestyle and information-oriented lifestyle, the women in Korea were higher than the women in America. In family-centered lifestyle, the women in America were higher than the women in Korea. Second, when the study carried out factor analysis of clothing behavior, eight factors- aesthetics, indifference, interest, economical feasibility, sympathy, planning, brand-oriented tendency and individuality-were deducted. In interest, sympathy, planning and individuality, the women in Korea were higher than the women in America. On the other hand, in indifference and economical feasibility, the women in America were higher than the women in Korea. Third, in the women in Korea, their lifestyle had an effect on aesthetics, indifference, interest and brand-oriented tendency. Especially, information-oriented lifestyle had an effect on four clothing behaviors. In the Korean women, their outward appearance-oriented and leisure-oriented lifestyles had an effect on only aesthetics, indifference and interest.