The changes in body temperatures of students in physicals trained and untrained colleges have been studied as a funtion of garment styles t nc rthree different envizrearnental conditions (13±1, 21±1, 31±1℃, 60±5% RH, 0.25m/sec). Since exposures of the extremities of body affect the regulittion of body temperature, two types of garments, i.e., the skirt and the slacks, were used in order to observe the effects of the garment styles on the regulation of body temperatures. The skirt exposed the calf of the leg, while the slacks did not. Because the body temperature is regulated better for healtier people, the subjects were divided into two groups. one group was consisted of 2 untrained female students, and the other of 2 healthier female physical college students. 1. The rectal temperatures for those in skirt were 0.3℃ higher than for the ones in slacks at 13℃ regardless of the groups. The untrained group showed 0.3℃ higher rectal temperatures in skirt and 0.2℃ higher in slacks compared to the physical trained group. 2. The skin temperatures rose with the environmental temperatures, and the skirt gave larger mean skin temperathare by 01.5℃ at 21℃. 3. At 13℃, the untrained group felt colder, more wet, and slightly more uncomfortable for both skirt and slacks. It is concluded that the skirt is more effective in physiological defense against cold stimuli than the slacks at 13℃, and that the regulation of body temperature takes place more efficiently to the physical trained students.