Mackinaw cloth
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A mackinaw is a heavy dense water-repellent woolen cloth, such as Melton cloth. It was used to make a short coat of the same name, sometimes with a doubled shoulder, first worn by American loggers in the northern part of the Midwest in the mid-19th century logging boom. The term later spread to be universal.
There is a reference to the term "mackinaw" in The Music Man in the song, Wells Fargo Wagon. A character sings that a "mackinaw" was delivered to him by the Wells Fargo Wagon.