In order to show the direction of how to wear, we conducted researches into the real situation of the elementary school children's wearing in Hiroshima City. We weighed children's clothes, examined the materials of their clothes, and took the temperature between their clothes and the body heat in winter. In this report, taking up one unit in the textbook for the sixth grade, "How should we put on clothings, " we experimented to give pupils scientific knowledge of and make them understand the reasonable clothing habits through the real state of children's wearing. The result of this research indicates that there is an individual difference in the weight of children's clothes as the weather is getting cold. As to the materials of clothes, chemical fibre or mixed chemical one were more popular among children. On the temperature between clothes and body, we understood, it is very effective for keeping warmth to drees reasonably, though lightly. And we also observed that there were some children who, in clothes for winter, felt pretty cold in their hands and tiptoes.