Here’s an site that works like men’s tuxedo rental places:  Why buy a dress for $$$ that you’ll only wear one time?  Why indeed?

Rent the Runway is the ultimate fashion secret. It’s high fashion at 90% Off retail prices. Membership is free so keep your wardrobe fresh with your favorite designers.  You pick the dress you want and the date you want; you will get not only the one size, but a back-up size you select (justincase).  You keep the dress for either 4 or 8-days, after which you just return both sizes.  They handle the dry cleaning!   If you have any high-society plans (or ambitions) check out their selection.