As for what to wear, see my ballet-modern FAQ, also on my Web site.(I told you it was a shameless plug!)
As for where to buy, on short notice you'll have to make do withwhatever you can find, but for anything really good, look tomail-order. Discount Dance (www.discdance.com), Dance Distributors(800-33-DANCE) & Back Bay Dancewear (www.backbaydancewear.com) areall good & will send catalogs on request.
Tom Parsons