I work in a IT department of Construction Company. Most people are project managers / directors / accountants / administrators. Since they dress formally, our IT department follows the formal dress code too. However, I'm not so keen on it and would love to wear something casual. What do you guys wear to work?
I dress no differently than I would any other day to feel like myself and be confident. I absolutely refuse to work for any company with a dress code. The only exception is that I wouldn't wear something that could be considered offensive or with swearing on it. There's no specific rule against it, but I wouldn't want to offend a coworker unintentionally.
No dress code. I try to dress "presentable" should anyone care what I look like, but if I'm tired I usually go to work in whatever I had on (likely hoodie, jogging pants, slippers). If I feel fancy I will wear a suit jacket and nice shoes.
I've been working in software in San Francisco since 2001: i wear shorts and a collared shirt every day. I never have to interact with clients, though. I wear long pants when I interview for new jobs ;)