in Mary's first book, she said the Sullivan production company let them keep the outfits. but there are lots of outfits from their appearances that are never seen again:

*millie/rose/mame breakaway gownws
*gold mini dresses from Temps medley
*pink and chartreuse outfits from Fats Waller medley
*white gown with gold chain from Funny Girl medley
*gold mini dresses from Thou Swell
*tuxes from I Get A Kick