Noun
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the attire characteristic of a country or a time or a social class
"he wore his national costume"
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the prevalent fashion of dress (including accessories and hair style as well as garments)
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unusual or period attire not characteristic of or appropriate to the time and place
"in spite of the heat he insisted on his woolen costume"
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the attire worn in a play or at a fancy dress ball
"he won the prize for best costume"
Verb
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furnish with costumes
as for a film or play
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dress in a costume
"We dressed up for Halloween as pumpkins"
- dress up