fancy dresses

Noun

fancy dress (usually uncountable, plural fancy dresses)

1. (Australia, UK, usually) A costume, disguise to masquerade as something or someone else.
   • And yet here he was, if one could credit one's senses, about to take part in a fancy-dress ball, a form of entertainment notoriously a testing experience for the toughest. And he was attending that fancy-dress ball, mark you--not, like every other well-bred Englishman, as a Pierrot, but as...1934, P. G. Wodehouse, Right Ho, Jeeves
2. (usually) Formalwear.
3. (usually) Used other than figuratively or idiomatically: see fancy, dress.