Whites=solid white dress, white hose and white shoes
AHHHHHHHH!!!!! NOOOO!!! DON'T wear white hose!!! Wear nude (natural depending on your skin color) hose. It is like my biggest pet peeve when people wear unnatural looking hose (white, blue, green)--especially when you will be dressed head to toe in white. You don't want to look like a big ol' icecicle!
Just look natural! You would NEVER wear white hose to a job interview, so don't wear it to rush or as your "sorority whites".
Besides that, I say take SoCalgirl's advice for all it's worth. Absolutely ask about cream and see if you can borrow a white dress. If not, white's not in season, so check out the sale racks at the department stores.
Whew! Had to get that out!
Good luck!