Canadian Tuxedo
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.
Hey, we are going to a hockey/nascar/wrestling event. Bring your Canadian tuxedo.