So she actually dresses how she does because she really likes certain styles. But if that wasn't the reason, so what? Let's say a girl chose to wear sexy clothes because she wanted to be attractive to, perhaps men, or maybe if she swung the other way, to women. This would be a problem because? There's nothing ethically wrong with that. The only reason anyone has for having a problem with it is, they also want to attract those men and they're jealous because it looks like someone's better at it. Pathetic.
And then there's the guys who actually find it attractive, but instead of being grateful they see it as somehow an excuse to look down on the person who's giving them a gift. Creeps.
People can dress how they like. If they want to dress for comfort and function, that's fine. If they want to dress to be attractive to, say, me, that's fine too. If they want to make a punk anti-aesthetic statement, sure. Their business.