What I think is even funnier, as someone who moved around the country a lot, is it's often thought of as a regional thing when it's actually ubiquitous.

In Victoria BC, it's called a Langford Dinner Jacket. But if you're a blue-collar working class Canadian anywhere in the country, it's more likely than not you own or have owned one of these (which is good, 'cause they're a good warm layer).