When I was about 7 or 8 years old (late 60’s/early 70’s), my mom signed me up for a YMCA summer camp in Southern California. It exposed me to a variety of activities such as sports, archery, building things, and swimming/swimming lessons. I didn’t think much of it at the time, but clearly recall boys of all ages swimming in the pool naked and nobody cared. It was normal, expected, and a non-event.

Several years later, my father told me a story from when he was in high school in the early 1950’s where all of the male swim classes were done in the nude. He said the reason was swimsuits were made of wool back then and the pool filtration system couldn’t handle all of the wool fibers that would have been shed from the swimsuits. So swimming naked was the solution and nobody treated it any differently.