Clothes and accessories worn on the body, especially elegant or formal dress; the act of dressing or putting on clothes.
From attire + -ment (a suffix forming nouns indicating action or condition), with attire from Old French attirer. The word entered English in the 14th century as both a noun for clothing and for the action of dressing.
Attirement appears frequently in old legal documents when describing clothing left in wills—it was considered valuable enough to list separately, like 'all my fine attirement in silk.' It tells us that fabric and fashion were once major investments, not disposable goods.
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