QUOTE(Scaramouche @ Jul 2 2008, 06:52 PM)

What do I wear? Can I wear something skimpy

?
Well, if you're most comfortable in skimpy...
Seriously, wear something comfortable. Unlike TG exams, you aren't assessed on stagecraft, so marks aren't awarded or deducted for dress. Go for something dressy if it helps you get in to performnce mode, but (clean) jeans and shirt if you'll otherwise be fretting about wardrobe malfunctions.
Make sure you can actually play in what you intend to wear and that you can stand up for 35+ minutes in the shoes you'll be wearing.
I tend to get very hot whilst playing, but didn't know quite what the temperature would be like, so wore a dress with a jacket I could remove if necessary. I also made sure my hair was pinned up so that I didn't get too hot.