"Why boys were required to swim nude" in Chicago public schools
Another consideration was money. In 1961, the Menasha, Wisconsin school board successfully blocked a parental challenge to the nude rule by claiming it would cost up to $3,000 to buy suits for the boys. CPS would have had to fork over even more money to buy suits for all its male freshmen.
In addition to sanitation and cleanliness, the Menasha officials further defended the practice by saying it “promoted … time saving and the development of good physical education attitudes.”