Definition of fancy dress noun from the Oxford Advanced Learner's Dictionary

 

fancy dress

 noun
noun
BrE
 
; NAmE
 
[uncountable](British English)
 
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clothes that you wear, especially at parties, to make you appear to be a different character guests in fancy dress a fancy-dress party see also costume, masqueradeExtra examples Many of the marathon runners compete in fancy dress. Several of the managers donned fancy dress for the office party. I went to a fancy dress party as a pirate. The streets were full of people in fancy dress.