a short tunic or jacket of chain mail or armor worn under a knight's outer armor in the medieval period.
From Old French 'hagueton' or 'auqueton,' possibly derived from Arabic 'al-qutn' (cotton), as quilted cotton garments were worn under armor; the word traveled through Norman French into English.
This word shows how medieval armor was borrowed from Islamic military technology—knights wore padded and quilted undergarments developed by Muslim armies, and the word itself traveled along the same trade routes as the technology!
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