From Media Watch comes this photo of acceptable skirt lengths for women, of which there are two. If you don't want to be harassed for being a trashy whore or chastised for dressing like a nun, you better abide.
This picture really resonates with me. Like many women, I've been subjected to the finger length test to confirm my skirt was long enough at school and been asked, while wearing a maxidress, why I was so covered up. There's some days a lady just can't win. (Good thing I'm no lady!) (Ugh.)
[Update: The photo is from artist Rosea Posey and, if I wasn't clear before, I think it's very powerful commentary that demonstrates the ridiculous amounts of pressure women are under to dress and look a certain way. And, if we don't conform, well, we were warned about the consequences.]