[quote name='MajorTom' timestamp='1323121963' post='4890846']
Just say putting on clothes took too long, so you optimized them out. You could probably mention it's a multi-threaded speedo too.
Interviewer: Really? What's the thread count?
You: 800
Interviewer: Nice! Can you start Monday?
[/quote]
Wrong. It'd be more like, OVER 9000!!!111
Seriously though, just wear something that you're comfortable in. I know if I went to an interview in a formal dress and a tie I would feel awkward. And your interview partner will immediately figure that out. I'd just wear a clean pair of jeans, a collared shirt, some nice pair of shoes. Don't forget to shave and get a fresh haircut ;)