That is why they were tank pool suits. Context is important. Playboy, and Penthouse magazine made nudity the new irresistible sin. I went to a private school. This has been addressed very well here, but here is an article about the subject as well.
Our camp director agreed.
But beware of the NPS rangers patrolling. Later I was a swim team manager under legendary coach Bob Muir for a couple years. Most of our pictures are in jacket and tie, required dress. In the early years, women were not allowed to even attend the competitions. The posted team lists used the "will dress for the meet game or whatever.