Yes, is the answer.
Canadians do use the same terminology, but as a nation they retained the awareness, irony and sarcasm genes which were bred out of Americans, so they would sort of know what you meant.
To get across your original imagery to the Yanks you would need to use the words 'singlet' and 'y-fronts', I reckon. Cupboards are closets, by the way. I know you didn't ask, just sayin'...