benignuman –
anything that Bnos Yisroel have a minhag to keep covered must be kept covered
Sounds quite fluid, doesn’t it? Who is to say that a minhag can even exist in places where the general population is not careful about something? If people are generally used to seeing it, and your typical woman doesn’t cover it, you are still going to call “minhag tznius”??
Furthermore, if your whole argument rests on this then you shouldn’t be using terms like “assur” and “muttar.” It would be more fitting to say “this is what a Jewish woman does” and “this is not what a Jewish woman does.” But I don’t agree anyway, because to see what a Jewish woman does, you look at what the Jewish women do.
There is an assumption therefore that if men are not allowed to look, then women must cover “erva” up.
Yes, I know very well that there is such an assumption. I am challenging it.