I'd like to echo the "business casual" problem. It's the equivalent of saying something is "interesting"--it's an empty, overused modifier that lacks true meaning. That said, thank God my firm is business casual this summer because I know it means I don't have to wear a suit! Skirts, hosiery, shoes, jewelry, jackets, color limitations are all still being hashed out. As far as the class connection, it's there but often inaccurate. It's one mutable quality that we continue to rely on for social cues (which makes sense to some extent), but it's also highly inaccurate. Ex. There are hipsters who spend tons of money to look like everything was purchased vintage or just-rolled-out-of-bed, while broke college students scrap to buy expensive(looking) suits to fit in at their jobs. Another question is at what point does individual preference/style come into play in this sort of discussion? I know for me, I like to at least know what the rules are so I can bend/break them intentionally.

Men, at least you don't have to wear pantyhose. I found these discussions entertaining. For your enjoyment/procrastination: Jezebel talks hosiery Wall Street Journal -- MiaWhite - 06 Jun 2008