The deep ways in which women and men value themselves and each other. If you really think it is modest to cover yourself up so that you don't get looked at / fancied by a strange man, and that that doesn't apply the other way around (i.e. men don't have to cover up so they don't get fancied by a strange woman), what does that say? That women are responsible for men's sexual response, and that therefore women are to blame if they are not modest, and women are to blame in cases of rape and molestation, women are to blame when men do bad things.
Look at honour killings, look at old male judge's beliefs that women shouldn't dress immodestly or get drunk if they want to avoid rape, and the same issue in India with the police believing that, look at the DV statistics, look at the DM blaming single mothers and not the men who ran away and ditched their responsibilities. It all stems from the same deep problem, that women aren't valued and respected in the same way men are, and that women get the blame when men behave badly.
I don't like anything that perpetuates that inequality, even if on an individual level, the woman is happy and in control. She might be happy and in control (or think she is) but what concerns me is the message she's sending. Other women, men and children take in that message on a deep, not necessarily conscious level.