The purpose of this study was to investigate the relationships among the variables of attitudes toward school uniform, three aspects of clothing behavior, self-concept, and selected behaviors. Instruments used to test the hypotheses were 12 items selected from the Behavior Test by Laubach, The Perceptual Orientation Scale by Choi, 14 items to assess the attitudes toward school uniform, and 21 modified items to evaluate conformity, fashion, and modesty in clothing. The questionnaires were completed by 484 2nd grade junior and senior high school girls in Seoul. Statistical analysis was performed using the correlation coefficient, $x^2$-tests, and t-tests. The findings could be summarized as follows: 1) Perceptual Orientation and Behavioral Orientation were not significantly related to attitudes toward school uniform. 2) Perceptual Orientation and Behavioral Orientation were negatively related to clothing conformity, 3) Attitudes toward school uniform and clothing behavior were partially different by the grade level and the type of school. 4) Fashion was positively related to conformity, but negatively related to modesty in clothing.