Jeans are a no-no for me. They bunch up in all the wrong places (crotchular region) and aren't loose enough half the time. Khakis are my absolute standby, I love khaki cargo pants for some reason. (Sooo much room... )
I'm a big fan of button up Hawaiian-style shirts too. Once you go silk, you never go back.
So I guess my clothing choices put me on the nerd-preppy side of the scale. =P