The aim of the present studies was to find how people wear differently depending on season when the ambient temperature(Ta) was lowered from 33 degrees C to 6 degrees C in 90 min. Seven female young adults volunteered as subjects. The experiments consisting of laboratory and field ones were carried out in July, October, January and April throughout the year. When Ta was lowered in the laboratory experiment, the half-naked subject was instructed to wear freely. In the field experiment the subject was instructed to survey everyday for a month in each season what she wore and how the garments worn each day weighted. Tas in Nara city were seasonally collected from Nara weather station. Although the clothing weight increased proportionally to the decrease of Ta, there did not exist any seasonal changes in the clothing weight worn and also the thermophysiological parameters in the laboratory experiment. Field experiment disclosed that the clothing weight worn was the heaviest in winter and the lightest in summer, while no differences existed in the clothing weight between spring and autumn.