Obs. Erroneously shortened from copped tank: see COPINTANK.
1688. R. Holme, Armoury, II. 55/2. Like long Hatters Blocks, or capped tanks, i.e. Hats with Brims. Ibid., III. 271/1. A Womans Head couped … on her Head a Capped Tank Embowed, and Tied under her Chin. Ibid., 395/2. Mens heads are … covered with … Caps, Cowles, Tankes, Morions, Insulas, Hats and Hoods.
