Where do they sell clothes for men with broad shoulders?

I always had this problem that my upper body has a width to height ratio of 1:1 (imagine something like pitbull dog) so if I buy a T-shirt of proper size, my shoulders are squeezed or my torso is hugged so tight that it causes discomfort and sweating. So far I found literally only one place that sells clothes that fit me and it's American Eagle (type of clothes they call "muscular"). However I would like to try different brands and styles but I'm tired of wearing very long and broad at torso shirts. I'm sure that there are many guys from the West here who workout and have the same problem. Any ideas would be greatly appreciated.

by zimmer1569