[n] the attire worn in a play or at a fancy dress ball; "he won the prize for best costume"
[n] the attire characteristic of a country or a time or a social class; "he wore his national costume"
[n] 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"
[n] the prevalent fashion of dress (including accessories and hair style as well as garments)
[adj] characterized by the use of period costume or fancy dress; "a costume movie"; "a costume ball"
[v] dress in a costume; "We dressed up for Halloween as pumpkins"
[v] furnish with costumes; as for a film or play