Where could I find a classy, long length Blazer jacket?

I was wondering if anyone knew where to buy a 3-button blazer style jacket with the length of a duster/trench coat, because I don't seem to be able to find what I'm after. Im looking for one that's stylish and tasteful, preferably in dark brown/black leather or suede. (P.S. I'm a dude, so don't be linking me women's clothes lol)