[phisigduchesscv]

depends on if your party is more women then men. But something along the lines of wear your bridesmaids dress party - gives everyone a chance to wear it one more time since they usually pay a lot for it. You could specificy your ugliest bridesmaids dress but someone may be upset if the dress you wear is the one she chose for her wedding. You could even have the guys wear suits or tuxes to go with the theme.