MillyR, I wanted to stand up and cheer when I read this: "It is not the responsibility of women or girls to make some choice between appearing to have no sexuality or alternatively being judged as consenting to sexual attention from everyone. That is a non-choice."
That's what I was trying to say earlier, girls do this "to look like their friends, to cheekily subvert the boredom of school uniform, and possibly in the hope that Jake in 12A will think they look fit. They are not doing it...to impress the generality of boys and men with how they're up for it." Apart from the other reasons (the prevalent ones IME) the "sexual" side of it is generally targetted at someone they fancy. The same reason that adult men and women may put a bit more time into doing their hair if they've got their eye on someone at work, say. It is NOT a way of declaring open season for catcalls, groping, rude comments and whatever other shit these girls are getting, from any passing male.
Actually forget school for a minute, why can't we just have a culture where it's assumed that NO-ONE wants to be groped/sexually assaulted/catcalled/verbally abused/openly leered over on the basis of what they're wearing? The men and boys doing this know that it's unwanted - that's one of the reasons they find it fun. Clothes or makeup or the way someone talks - they're all just excuses so when someone (for once) calls them out on it, they've got someone to blame for their behaviour. The victim.
Somehow this society has swallowed this excuse, but it has to stop.
NG - you asked earlier how to explain to boys that the girls do want attention, just not from them. Well, it's one of the most important lessons that kids need to learn, how to respect the feelings and wishes of others, so we'd better get up the guts to teach them.
It's bewildering how some people talk about this. How are these poor boys/men supposed to know that she didn't want groping? She was wearing a short skirt after all. I don't know, how about striking up a conversation? Or how about assuming that a girl you're not on familiar terms with doesn't want assaulting?