pastel bridesmaid dresses

Does anyone happen to have a fabulous old prom or bridesmaid dress they might to be willing to donate to a great cause? (Soph is the fairy godmother in her school play). I'm thinking pastel, foofy, something I could add some glitz to fit my little fairy godmother? Just thought I'd put it out there- my efforts at Goodwill are proving futile... pastel bridesmaid dresses