A mailcoat, also known as a chainmail shirt or hauberk, is a type of armor made from interconnected metal rings, providing protection while allowing flexibility and mobility. It typically covers the torso and can extend to the arms and sometimes the thighs. Mailcoats were commonly used in medieval warfare, offering a balance between defense and weight, making them effective for soldiers and knights. They were often worn under plate armor for added protection.
a coat made from mail is called a mailcoat
Middle English jaket, from Old French jaquet, diminutive of jaque, short jacket, tunic, from jacques, nickname for French peasants (from the name Jacques; see http://www.answers.com/topic/jack) or from Old Catalan jaco (perhaps from Arabic šakk, mailcoat).