Eaton Center?

If you're coming to Toronto from the US, you probably wouldn't want to shop here, because almost everything is more expensive. But then here you can find Roots (a Canadian brand, not sure if it has stores in the US), which has excellent leather products. And then there's Club Monaco, a brand that's not very commonly found in the US. You could find both stores at Eaton Center @ Yonge & Dundas (or Queen). You could also try Winners, with many stores in the downtown area.