A thick blanket used by the Indians of the North-West.
1839. We had Mackinaw-blankets, stretched upon balsam branches, to recline upon.C. F. Hoffman, Wild Scenes, i. 1134 (Lond.).
1851. My Mackinaw, a great favoritefor it makes my bed by night, and my great-coat on other occasions.Mayne Reid, The Scalp Hunters, p. 17. (N.E.D.)
1856. My physicianthats mestrongly recommended a tent, a soft plank, and a Mackinaw blanket.Putnams Mag., viii. 384/2 (Oct.).
1857. Mac was making a variety of contortions between heaven and a mackinaw.San Francisco Call, Jan. 29.