We're all a bit too caught up in the idea of *modesty.* If the reason behind modesty is to keep people's mind's pure, you're never going to win. Back in the day, showing your ankles was forbidden. Then it was your bellybutton. In some places currently, a woman's hair must be covered for fear of lust. In temperate coastal places, people hardly wear anything, and it's normal and fine. So clearly there's no universal line to cross with women's clothing that makes something inherently inappropriate. There are cultural expectations, but those are prone to change.
I'm not taking sides. I'm just saying it's all relative. It really really is.