jack (n.) Old form(s): Iacks
jacket, tunic, coat [usually of quilted leather]
1H4 IV.ii.47[Prince Hal to Falstaff] How now, blown Jack? How now, quilt?
E3 I.ii.29[King David to Lorraine, of the Scots soldiers] never shall [they] ... lay aside their jacks of gimmaled mail
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