fancy dress

1. N-UNCOUNT Fancy dress is clothing that you wear for a party at which everyone tries to look like a famous person or a person from a story, from history, or from a particular profession. 化裝舞會服裝[oft N n]

Guests were told to come in fancy dress. 客人們已被告悉應穿著化裝舞會服裝赴會。