Etymology
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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.

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costume (v.)

to dress, furnish with a costume," "1823, from costume (n.). Related: Costumed; costuming.

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costumier (n.)

"one who makes or deals in costumes," 1831, from French costumier, from costumer, verb from costume (see costume (n.)).

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cosplay (n.)

"practice or hobby of dressing as a character from a movie, book, or video game, especially one from Japanese manga and anime," 1993, according to Merriam-Webster, from costume (n.) + play (n.), based on a Japanese word formed from the same English elements and alleged to date from 1983. Also used as a verb.

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custom (n.)

c. 1200, custume, "habitual practice," either of an individual or a nation or community, from Old French costume "custom, habit, practice; clothes, dress" (12c., Modern French coutume), from Vulgar Latin *consuetumen, from Latin consuetudinem (nominative consuetudo) "habit, usage, way, practice, tradition, familiarity," from consuetus, past participle of consuescere "accustom," from com-, intensive prefix (see com-), + suescere "become used to, accustom oneself," related to sui, genitive of suus "oneself," from PIE *swe- "oneself" (see idiom).

Custom implies continued volition, the choice to keep doing what one has done; as compared with manner and fashion, it implies a good deal of permanence. [Century Dictionary]

A doublet of costume. An Old English word for it was þeaw. Meaning "the practice of buying goods at some particular place" is from 1590s. Sense of a "regular" toll or tax on goods is early 14c. The native word here is toll (n.).

Custom-house "government office at a point of import and export for the collection of customs" is from late 15c. Customs "area at a seaport, airport, etc., where baggage is examined" is by 1921.

Old customs! Oh! I love the sound,
  However simple they may be:
Whate'er with time has sanction found,
  Is welcome, and is dear to me.
Pride grows above simplicity,
  And spurns it from her haughty mind,
And soon the poet's song will be
  The only refuge they can find.
[from "December," John Clare, 1827]
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get-up (n.)

also getup, 1847, "equipment, costume," from get (v.) + up (adv.). Meaning "initiative, energy" recorded from 1841. The verbal phrase is recorded from mid-14c. as "to rise."

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bathing (n.)

1540s, verbal noun from bathe (v.). Bathing suit is recorded from 1852 (bathing costume from 1830); bathing beauty is from 1891, in reference to Frederick Leighton's "The Bath of Venus."

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tank top (n.)

1968, from tank suit "one-piece bathing costume" (1920s), so called because it was worn in a swimming tank (n.), i.e. pool.

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periwig (n.)

"peruke, artificial imitation of a head of hair," worn as a fashionable accessory or as part of a professional costume, 1520s, perwyke, a popular corruption of perruck, from French perruque (see peruke), evidently by simulation of the French pronunciation and the influence of peri-.

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accustom (v.)

"familiarize by custom or use," early 15c., accustomen, from Old French acostumer "become accustomed; accustom, bring into use" (12c., Modern French accoutumer), from à "to" (see ad-) + verb from costume "habit, practice" (see custom (n.)). Related: Accustomed; accustoming.

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