Sof, I’m aware of what the shulchan aruch says regarding dressing.
If the problem is the little boys, then little boys shouldn’t be allowed at the pool. Not that the woman should dress in more clothing at the pool.
Perhaps the problem is more about making everything assur. If its muttar, it should be up to the individual woman to decide. It shouldn’t be large groups of people screaming that it shouldn’t be done.
Unfortunately, this 100% affects young women. Everything is forbidden to them, even if its allowed. When everything is assur, nothing really matters.
Think I’m wrong? When I was younger, long skirts were assured, even though they are 100% muttar. So women started wearing shorter skirts. And now, women aren’t covering their knees. If people would stop concentrating on assuring the muttar, maybe people would follow basic halacha.