probably borrowed from Middle French camisade (with suffix conformed to Spanish -ado, used in comparable words), borrowed from an Upper Italian outcome of Italian (Tuscan) camiciata "night attack, originally one in which the assailants wear white shirts over their armor as a means of recognition," from camicia "shirt" (going back to Late Latin camīsia) + -ata, suffix of action and result — more at chemise, -ade
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