I don't really think girls are to fault with what they wear. When you go to a clothing store of any kind, the majority of clothes avaliable are normally very showy with deep necks that could just about reach the navel.

Its just the fact that there aren't many options out there to turn to besides stuffily, out of date clothes from forty years ago to the new 'too revealing' clothes of today. Once one company started to make the revealing trend, just about every other one followed and its hard to find anything tastefully fashionable when there aren't many options.