1. clothes worn to look like someone or something else, especially for a play, party, or Halloween
2. clothing typical of a particular country, period, or group

1. to dress someone in a costume

Examples

• The children wore Halloween costumes to school.
• She designed elaborate costumes for the theater production.
• The museum displayed traditional Japanese costumes.
• He costumes the actors before each performance.
• Victorian costumes were featured in the historical drama.
• The costume party required everyone to dress as movie characters.
• Traditional folk costumes varied by region.