I read a decidedly un-PC review of the fashion industry that focused specifically on the models and presentation. It stated that (with more than a small amount of supporting evidence) the prevalence of gay men holding principle positions in the fashion industry accounted for the look and trajectory. According to the author, at its worst there was an undercurrent of misogyny in the presentation and in general the female model type often shared as much physically with a boy as they would with a woman (essentially skinny effeminate boys with breasts).

I don't follow the industry enough to have a developed opinion, but it was an interesting read.