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(kŏs′to͞om′, -tyo͞om′)
1. A style of dress, including garments, accessories, and hairstyle, especially as characteristic of a particular country, period, or people.
2. An outfit or a disguise worn on Mardi Gras, Halloween, or similar occasions.
3. A set of clothes appropriate for a particular occasion or season.
tr.v. (kŏ-sto͞om′, -styo͞om′, kŏs′to͞om′, -tyo͞om′) cos·tumed, cos·tum·ing, cos·tumes
1. To put a costume on; dress.
2. To design or furnish costumes for.

[French, from Italian, style, dress, from Old Italian, custom, ultimately (possibly via Vulgar Latin *cōnstūmen, *cōnstūmin-), from alteration of Latin cōnsuētūdō, cōnsuētūdin-; see custom.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.costumed - dressed in clothing characteristic of a period, country, or class
clad, clothed - wearing or provided with clothing; sometimes used in combination; "clothed and in his right mind"- Bible; "proud of her well-clothed family"; "nurses clad in white"; "white-clad nurses"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in classic literature ?
As for the company of foxes assembled to dine with the strangers, they were most beautifully costumed, and their rich dresses made Dorothy's simple gown and Button-Bright's sailor suit and the shaggy man's shaggy clothes look commonplace.
Naturally, costumed attendees of anime conventions in the United States then adopted the term, and as time progressed, the word has developed a much broader definition.
In the United States, the ritual of costumed children going door to door for a "trick-or-treat" did not start until the 1920s, and one factor in establishing this new children's ritual was an article in a 1920 issue of Ladies' Home Journal describing this new activity (Feldman , 2001).