Disgustingly unfashionable clothing worn by Canadians or blue-collar Americans. They usually refer to one of the two...
1) Denim on denim. A
jean jacket with a matching pair of jeans.
2) A plaid button-down shirt and a pair of dickies.
Like the guido tuxedo (tracksuit
shananigans), these clothes aren't suited for anything other than a casual party. Unlike the guido tuxedo, a Canadian tuxedo isn't really suited for a casual party either.