Just go down to the Papineau area--they have all of the cut-off jean shorts, leather caps, and shirts to knot above your navel, that you could want.
But seriously... getting something that fits doesn't have to mean that it has to be tight. Just talk to a salesperson at Mexx, America, Benneton, and they'll give you good advice on what fits. If it contradicts what your friends say, too bad for them!