While I was at the swimming pool the other day with my kids, there was a young guy - mid-twenties I would say - wearing a pink floral ladies bathing suit. He was with three male friends of about the same age. His friends were dressed normally - in male trunks - and they were all going about their swimming activity without a care in the world, despite the large crowd of over 500 people.
The guys weren't behaving badly, or making any kind of fuss, and it would hardly be worth mentioning, other than the fact that nobody stared and nobody really cared, because there was nothing going on except one guy had chosen for whatever reason to put on a ladies bathing suit.
I thought the guys had either done it for fun, or the "poor" guy in pink was short of a bathing costume and had to borrow one from a girlfriend. I guess others passed it off for similar reasons.