[at-fates-hands]

Also, your recruiter should be telling you what to wear to the interview regardless. If not, then you should ask what is to be expected.

You've got a good point about dressing down though. It's easier to walk into an interview in a suit and have people laugh it off and say, "Oh man, we don't dress that nice unless someone important is here!" instead of going in with jeans and an untucked shirt and have people dressed in business casual give you a strange look like, "Hmmmm, interesting wardrobe choice." and instantly you've lost points with them before they even ask a single question.