Costume
early 18th century: from French, from Italian costume ‘custom, fashion, habit’, from Latin consuetudo (see custom).
wiktionary
From Middle English costume, custume, from Old French costume, custume, from Italian costume, from a Vulgar Latin*cōnsuētūmen or *costūmen, from Latin cōnsuētūdinem, accusative singular of cōnsuētūdō(“custom, habit”), from cōnsuēscō(“accustom, habituate”), from con-(“with”) + suēscō(“become used or accustomed to”). First element con- derives from cum, from Old Latin com, from Proto-Italic *kom, from Proto-Indo-European *ḱóm(“with, along”). Second element suēscō is from Proto-Indo-European *swe-dʰh₁-sk-, from *swé(“self”) + *dʰeh₁-(“to put, place, set”); related to Latin suus(“one's own, his own”). Doublet of consuetude and custom, which shares most of this etymology.
Verb circa 1823.
etymonline
costume (n.)
1715, "style of dress," but also more broadly "custom or usage with respect to place and time, as represented in art or literature; distinctive action, appearance, arms, furniture, etc.," from French costume (17c.), from Italian costume "fashion, habit," from Latin consuetudinem (nominative consuetudo) "custom, habit, usage." Essentially the same word as custom but arriving by a different path.
It originally was an art term, referring to congruity in representation. From "customary clothes of the particular period in which the scene is laid," the meaning broadened by 1818 to "any defined mode of dress, external dress." Costume jewelry, made to be worn as an accessory to fashionable costume, is attested by 1917. Related: Costumic.
costume (v.)
to dress, furnish with a costume," "1823, from costume (n.). Related: Costumed; costuming.
