1. clothing worn to look like someone or something else, especially for a party or performance
2. the clothes worn by actors in a play or movie
3. clothing typical of a particular country, period, or group

1. to dress someone in a costume

Examples

• She wore a witch costume for Halloween.
• The actors’ costumes were designed by a famous artist.
• The museum displayed traditional Japanese costumes.
• The theater company costumed the entire cast in period clothing.
• His pirate costume won first prize at the party.
• The costume designer worked for months on the elaborate outfits.
• Children love to dress up in costumes and pretend to be superheroes.