This study was carried out to examine the effects of textile materials for thermal insulation value using a thermal manikin. Cotton, polyester, wool, silk and rayon were selected as outer wears like blouses, skirts, slacks, and one-pieces. Acetate was chosen as a lining. Brief and long sleeve upper underwear(cotton) were chosen as the inner wears. The results were as follows; There were no significant differences among the materials in skirts and blouse-skirt suits by the thermal manikin. However blouses, slacks, one-pieces and blouse-slacks suits were showed the effects of materials. Blouse-slacks suits was showed the highest thermal insulation value and one-piece had the lowest thermal insulation value.