The purpose of this study was to identify the constructing factors of impression formation on man`s body revealing casual clothes by university students, and to investigate the effect of revealing clothing styles and perceiver`s gender on each factors of impression. The stimuli consisted of 12 color photogrphs including various styles of body revealing casual tops and bottoms; subject consisted of 310 male and female university student; subject observed 2 photographs each, ramdomly chosen from a pool of 12 and answered 37 semantic differentiol questions. Statistics applied for analysis were Factor Analysis, ANOVA and post hoc test. Results were; 1. Important factors constructing the impresstion of a male dressed in body revealing casual clothes were modesty, sexual stimulation and individuality. 2. The styles of the body exposure and perceiver`s gender had partial significant influence on impression formation.