Is there any credence to the view that those who do not cover knees and elbows are violating Halacha, as opposed to relying on a more lenient opinion of "shok" and "zeroah"? This thread - quotes knees and elbows as a bare minimum, without relevant sources, and a similar thread seems to suggest that it is widely debated and more "Dat Yehudit" (minhag) vs "Dat Moshe" (halacha).
Is it halachically wrong for women to wear skirts slightly above or at the knee? Or is it a matter of Minhag?