late 14c., Scottish bonat "soft, brimless hat for men," from Old French bonet, short for chapel de bonet, from bonet (12c., Modern French bonnet) "kind of cloth used as a headdress," from Medieval Latin bonitum, bonetum "material for hats," perhaps a shortening of Late Latin abonnis "a kind of cap" (7c.), which is perhaps from a Germanic source.
As a form of head-covering worn by women out-of-doors, late 15c. As a type of mechanical covering device, 1862.
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