Attire

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Middle English: from Old French atirier, atirer ‘equip’, from a tire ‘in order’, of unknown origin.

wiktionary

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From Middle English atyren, atiren, from Old French atirier(“to equip”), from a- + tire(“rank”), akin to German Zier(“ornament”) and Old Norse tírr(“glory, renown”).

etymonline

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attire (v.)

c. 1300, atiren, "to fit out, equip; to dress in finery, to adorn," from Old French atirer, earlier atirier "to equip, ready, prepare," from a- "to" (see ad-) + tire "order, row, dress" (see tier). Related: Attired; attiring.

attire (n.)

c. 1300, "equipment of a man-at-arms; apparel, dress, clothes," from attire (v.).