Meaning of “fancy dress” in the English Dictionary

british dictionary

"fancy dress" in British English

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fancy dressnoun [ U ]

uk /ˌfæ ˈdres/ us /ˌfæ ˈdres/ UK US costume

the special clothes that you wear for a party where everyone dresses as a particular type of character or thing:

a fancy-dress party
I thought he was in fancy dress.

(Definition of “fancy dress” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)