"He's a lumberjack and he's ok ..."
Lumberjack Day is for tall tales, log rolling, flapjacks and maple syrup, Paul Bunyan and Big Blue Oxen stories, and Buffalo Plaid!
Officially designated as the Roy Roy Macgregor tartan, this pattern is also unofficially known in the United States and Canada as the Paul Bunyan "buffalo plaid" or "buffalo check."
Native Americans called it "plaid" after interacting with fur traders and outdoorsman. Sometime in the late 1880s, the term "plaid" went mainstream, referring to what others would call tartan.
And in the mid-1800s, a clothing company from New England can be credited with producing the shirt which immediately became popular workers and outdoorsman, including lumberjacks.
The pattern was also favoured by cowboy hero Tom Mix and the mythical Marlboro Man.
This pattern has come to be loosely associated with the giant mythological lumberjack of North American folklore, Paul Bunyan, whose legendary exploits revolve around tall tales of his superhuman labors which include creating Minnesota's ten thousand lakes (including Lake Bemidji, which resembles Paul's giant footprint), and digging the Grand Canyon, by dragging his axe behind him!
Paul is customarily accompanied in these exploits by his companion, Babe or Blue, a giant ox, who was measured seven feet (or seven ax-handles) between his eyes, and fourteen feet between his horns.
The character of Paul Bunyan originated in the oral traditions of North American loggers, possibly related to a real person who figured in the 1837 Papineau Rebellion in Canada.
In the Two Mountain region in St. Eustache, Canada, the local French Canadians revolted against their new ruler, the Queen of England. Many local loggers joined the cause refusing to surrender to the English troops sent to quash the rebellion. The loggers armed themselves with axes, mattocks and large wooden forks they had steam bent into hooks. One of the rebels, a large bearded mountain man named Paul Bunyan, cut a wide swath amongst the Queen's troops. This Paul survived the rebellion and became highly respected among the loggers of the region for his deeds in battle. It is believed that exaggerrated tales of this Paul, along with those of other loggers, melded into the bunkhouse tales told by loggers to amuse themselves and impress tenderfoots.
It is believed that this particular tartan/plaid was introduced to North America by a descendant of Rob Roy - 'Jock McCluskey,' a sometimes lawman, bounty hunter, fur trapper, gold miner and eventually, Indian trader.
For more on the origins and etymology of the "buffalo plaid," click Paul and Babe, shown in this 1996 USA stamp.