Any frum married woman who has anything to do with the world outside the frum community is displaying tremendous mesiras nefesh, since for the last 60 years American women normally go bareheaded, and anyone who wears a hat, with very narrow exceptions, such as softball players, is regarding as weird and subject to varying forms of harassment and discrimination.
The halachos on this are well known, and the style discussion is irrelevant to any halachic discussion (albeit important to anthropologists and historians of costume and fashion).