To what extent do the standards of tznius apply to non-Jews living among Jews? For example, is a married Noachide woman's hair considered ervah? If not, why not?
I know that rules concerning tznius are not among the Noachide laws. Still, it seems strange that they would not apply theoretically, since
a Gentile woman is at least as forbidden to a Jewish man as another man's wife would be.
EDIT: On second thought, I'm pretty sure that's not true.