can you just ask them before the interview? "is it okay to wear a suit, or do you guys have a stick up your..."?

I personally dress like a hobo when I'm out and about, and wear a uniform of jeans and a blue shirt when I go into the office, so I really don't care about the suit either way. I'm wearing it for your benefit, so if you don't like it, just tell me upfront - don't make me guess if the job isn't about mindreading.