Just my 2 cents- there is s/t called halacha and there is s/t called “in the spirit of the law”. A tank top with a shell underneath, might be halachically tzniyus- meaning if it covers e/t and is not too tight…but for some reason it doesn’t have a tzniyus look. Its the same thing with ultra long skirts- it covers e/t, yet when it is worn it doen’t have that tzniyus look. So i don’t think its halachaically not OK. Though i am in no way advocating it.
