100% cotton dress / skirt that can be re-made and/or dyed into something cool afterwards is probably your best bet. OTOH, it occurs to me that ALL white might be within the letter of the rules, allowing you to go in geisha makeup, covering only the parts that they Require to be white ... ;-) If nothing else, it would seriously tick them off to have to ~cheat to complain, although they might jerk you around for just that reason.

My HS was all boys, so we had to go in tuxes, just like a wedding. It was not too bad as I don't mind dressing up occasionally, but I'm with you on the white; the only whites I have inevitably die quickly or devolve to 'only lounging around the house' clothes.