This research is one of the series of the investigation of both junior high schools's teaching materials of clothing which were reported at the second and third general meetings of the learned society. In my previous investigation, I indicated that the percentage of two-pieces had been as much as 97.6% and so that skirts or slacks had been used with them. Besides these, in patterns which had been attached to their textbooks, slacks had been as much as 17% next to the percentages of blouses and skirts, But there had been no examples of it in the drills of the junior high's new teaching principle, therefore I have chosen slacks as a theme of my study for this time. According to curriculum, students should sew slacks 41% at their junior high school, and they, on an average number, possess slacks 2.4 pieces each in reality and only two out of 322 students did not have it infact. Based on these facts it is preferable to simplify it and teach them how to sew it at junior high especially regarding to their own districts. If the sewing of it is impossible I would like teachers to guide them how to select and buy the ready-made ones.