It’s not only beautiful people that dress this way and that’s part of the problem with voicing an opinion on this topic. When you say “people don’t need to be mostly naked in the gym” everyone pictures an attractive young woman wearing an outfit they don’t personally mind. What I’m saying applies to fat old men, young girls, middle aged housewives, basement dwelling dweebs, and all the other groups of people you may encounter at the gym. If an outfit isn’t cool for everyone to wear then it shouldn’t be cool for the attractive exhibitionist to wear either.