Remember my Jeopardy! tryout?

Something like 22 more days to go!
But I woke up early this morning and now I can't get back to sleep. And its all because I don't know what to wear.
The e-mail from the Jeopardy! people says to dress as I would to be on the actual show. But what does that mean? Can I wear my signature khakis? Do I need a dress or skirt? I don't have a suit.
I told Brad that I was going to go shopping. But what do I shop for?