Wikipedia
Mackinaw cloth is a heavy dense water-repellent woolen cloth, similar to Melton cloth. It was used to make a short coat of the same name, sometimes with a doubled shoulder. These jackets have their origins on the Canadian frontier and were later made famous by American loggers in the upper Midwest during the mid-19th century logging boom. In Canada, the "Mac" is regarded as a marker of national identity and working-class values, and has been exploited for effect in Canadian comedy shows such as Second City Television and This Hour has 22 Minutes.
Usage examples of "mackinaw cloth".
This cloth had not withstood the hard usage of Labrador travel a week, and both men, when they bad a spare hour, occupied it in sewing on canvas patches, until now there was almost as much canvas patch as Mackinaw cloth in these garments.