Another telegraph from Captain Obvious:
It's probably cognitive dissonance. Most women seem to figure out in their teens that they compete on looks with each other, but only on an subconscious level. Especially for attention from, well, let's just call them "desirable" males. Somehow the conscious transfer is really difficult for them, but once it settles in some of them even feel exploited. But this only happens after said looks have aged like milk and they make impact with the cold, hard floor of reality.
Even the modern day communists with their "equality of outcome" are trying to get in on this, which is why we now have "healthy at every size" and "fat studies", trying to change the beauty standards by which they compete. This will never ever happen, because those beauty standards are set by other women (and a few gay men) in an everlasting cycle of coming and going fashions, in an attempt to fuck with each other and set a hierarchy.
I realized how truly fucked up the situation is when an ex-girlfriend once said: "I need a new snowboarding jacket, I can't go with the old one." - "Why not, is it damaged?" - "No, it's from last season, so they'll make fun of me behind my back."
To circle back to WoW: Remember when Chris Metzen told the story that his daughter asked him "why are they all in swimsuits?" - He should've told her "You'll figure that out once you are in your teens. In fact, I'll record this very conversation and play it back to you when I have to pull out the 'You can't go out dressed like that, you'll catch a cold' card."