And for my preferences...
I wear a LOT of jeans when I can. Definite jeans junkie like Sky is BLUE! I've got a bunch of t-shirts from shirt.woot.com that I wear a lot.
When I'm bumming around my apartment, I use pj pants and t-shirts I acquired through college.
For work I wear pants (most of them black, but I have khaki and gray too), sweaters or polos for the most part, sometimes button up shirts. I have to wear a belt if the pants have belt tabs... And I'm supposed to tuck in polo shirts. Our dress code is stupid. It doesn't matter what we look like when we're coding in a cube! /rant