costume -
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"
costume -
the prevalent fashion of dress (including accessories and hair style as well as garments)
Verb
costume -
dress in a costume; "We dressed up for Halloween as pumpkins"
costume -
To dress or adorn with a costume or appropriate garb.
Wikipedia
The term costume can refer to wardrobe and dress in general, or to the distinctive style of dress of a particular people, class, or period. Costume may also refer to the artistic arrangement of accessories in a picture, statue, poem, or play, appropriate to the time, place, or other circumstances represented or described, or to a particular style of clothing worn to portray the wearer as a character or type of character other than their regular persona at a social event such as a masquerade, a fancy dress party or in an artistic theatrical performance.