Well, as my geek code says I can dress up, but most of the
time it's jeans and t-shirts. Occasionaly shirts of the
banded collar and long sleeve variety. I once worked for
a computer money laundering scheme that was part of a bank.
For that I had to wear tie, slacks, etc... They didn't like
the chainmail tie either.
I would say my favorite shirt was one with a programmer
at his computer with "Work or DIE Project"
on screen with the caption "I work best with a gun to my
head" Same artist has a shirt with a
caffiene bell curve
with the the top being "See God" and then the end of the
curve having "Triple Shotgun Murder"
I worked for one company that distributed a T-shirt
with "*!$# Symantec" on it. (We were being sued by them)