Doesn't this rely on cultural norms of what is attractive?
And is largely subjective anyway?
I don't think it does rely on cultural specific norms of what is attractive because -- so far as I know -- every culture on earth has one concept or another of women being physically attractive.
Can you name even one culture which has no concept or notion of women as physically attractive? It's true, I think, that specific notions of what makes a woman physically attractive vary from culture to culture. For instance, in Japan, a woman's neck was traditionally considered one of the most physically attractive aspects of her body, while many or most other cultures never placed such emphasis on the neck. So specific notions of what makes a woman attractive somewhat vary from culture to culture (there are also a very few cross-cultural universals too, such as the rosy glow of heath, facial symmetry, etc.),
but it seems that all cultures have a concept of physical attractiveness for women. But please correct me if I'm wrong about that.
I submit that making a woman (or for that matter a man -- but the OP is not discussing men) cover up those features of her that would be considered physically attractive in her culture reduces the number of men who will be physically attracted to her. All else being equal, that most likely reduces the pool of men from which she can pick and choose a mate or mates.
Note: Nothing in the above paragraphs should be taken to imply that all cultures don't also have a notion or concept of physical attractiveness for men.
Second Note: Nothing in the above paragraphs should be taken to imply that women don't also attract men to them via means having nothing to do with physical attractiveness, such as by the qualities of their personalities, or by their skills and accomplishments, etc.
Third Note: Nothing in the above paragraphs should be taken to imply that women must intend to attract men physically in order to attract men physically, nor imply that a women who does not intend to attract men physically never attracts men physically.
Fourth Note: Nothing in the above paragraphs should be taken to imply that a man whose initial attraction to a woman is physical never comes to be attracted to that woman for any other reasons than her physical attractiveness to him.
Fifth Note: Nothing in the above paragraphs should be taken to imply that all men -- or even that a majority of men -- are
only physically attracted to women.
Sixth Note: Nothing in the above paragraphs should be taken to imply that women's dress comes in only two styles: Madonna and whore. i.e. That she either covers up or she dresses "provocatively".
Seventh Note: Nothing in the above paragraphs should be taken to imply anything that is not explicitly stated in the above paragraphs.