Certainly seems odd that girls could wear swimsuits. Odd too that adult males could use swimtrunks at the same time male youths couldn't (so it didn't have anything to do with, "we just cleaned the pool").
Much as the notion of photographing countless people in the nude at hospitals and universities for somotyping stopped. Some of those college archives still exist and some have been destroyed. They are reputed to include such people as GHW Bush and Hillary Clinton in the buff from their college days. All in the name of science, personal liberty be damned.