The other thing I would tell you, OP, is you seem to be vastly underestimating the amount of things women get told are going to prompt others to lust over them. Forget leggings - I’ve been told that pants are going to make men lust over me. Or makeup of any sort. Or knee length skirts, or short sleeves, Really, in our society, as a woman I find that the messages that this or that or the other is distracting to men to be overwhelming enough that I pretty much have to ignore them.
That’s where a lot of the “it’s not for men” attitude comes from - the bombardment as a woman with the idea that no matter what we wear it is obvious to someone that that one thing is immodest.
It’s often quite clear to any individual man what things are immodest, but different men really do have very different standards. When as a woman, you get the message that you will be objectified no matter what, it’s much easier to throw your hands up in the air and say, fine, I can’t win so I’m just going to wear what I like. Even modest women are almost all going to draw the line at some place other than where some men want it.
Any modesty discussion on CAF will have some of that. Since we’re on a Catholic forum, the vast majority of women will believe in and practice modesty in some form. But there’s a lot of argument because different people think different things are obviously immodest.