I think it's funny, the awkward dance our society does around sex. Like here: it obviously disturbs most of you (and I'm not gonna lie, I share that instinctual revulsion, wherever it stems from) to see provocatively dressed elementary schoolers, and yet you can't quite put words to exactly what's wrong about it. I don't doubt that most people would agree with me when I say murder is a more severe transgression than consensual sex outside of marriage, yet there's still a very unambiguous hostility towards "hookers" and the like. That's very interesting to me, and when I say that I don't mean I think it's wrong that we feel the way we do about the issue, just that... it's, well, interesting.
I do think it's an over-generalization to state certainly that our little girls are "growing up faster". Remember Juliet? Girls used to be considered marriageable at a much younger age, and yet would you consider a young sixteenth-century housewife to be "oversexed"?
I think it's funny that people keep saying "Why don't they want to live their childhood innocently?" D: I think the entire reason that these girls dress the way they do is because they don't understand the social stigma revealing clothing carries with it. That's pretty much the definition of innocence, in my opinion.