The purpose of this study was to obtain the basal information for standard amount of clothing weight indoor climate and working condition with investigating seasonal changes of skin temperature and factors influencing on that in Koreans. Forty eight subjects in 5 age groups(6-11, 12-19, 20-44, 45-64, 65-76 years old) with both sexs were measured skin temperature indoor climate clothing microclimate clothing weight and skinfold thickness in neutral condition in each month throughout the year. The results obtained are summarized as follows : 1. Indoor climate koreans felt comfortable ranged 18.1-28.7$^{circ}C$ and 51-74%RH. 2. Temperature inside the clothing ranged 30.8-32.3$^{circ}C$ in males and 31.0-32.5$^{circ}C$in females. There was a significant difference in temperature inside the clothing among age groups : That of 6019 age group was slightly higher than that at 45-76 age group. 3. Total clothing weight changed with season and increased in order of summer autumn spring and winter Total clothing weight of 65-76 age group was significantly greater on January and February. Breast skinfold thickness showed the smallest value in summer and the largest value in winter year. In addition to breast and abdomen skinfold thickness were larger in 45-67 age group while thigh skinfold thickness was larger in 6-19 age group. Skinfold thickness in females showed the smallest value in spring summer and the largest value in autumn and winter. In addition to triceps and suprailliac skinfold thickness were larger in 45-64 age group while thigh skinfold thickness was larger in 12-19 age goup. 5. Temperature of the lower limbs(hand, thigh. leg, and foot) showed significant correlation with the indoor temperature humidity inside clothing and total clothing weight. Temperature of the torso(breast and abdomen) showed significant correlation with the temperature inside clothing in all subjects. Abdomen skinfold thickness of all age group in male showed significant correlation with the abdomen skin temperature. triceps suprailliac and thigh skinfold thickness of 6-11 age group in female showed significant correation the upperarm abdomen and thigh skin temperature. Consequently clothing mdicroclimate total clothing weight and skinfold thickness showed significant difference in season sex and ages and had a slight effect on skin temperature.