Gentlemen, the overcoat is designed to go over a three piece suit so knowing this I would suggest purchasing this coat a size smaller than your normal size as to wear with and without a suit and have it fit appropriately.
Stats: I'm 5'11, 300 lbs and I bought the 54 regular, a size smaller than my normal size. I wore the coat over a long sleeve shirt, wool vest and sports jacket and the coat did not disappoint.
Performance: The coat is very warm, comfortable and as handsome as is displayed in the photo.
Appearance: You tell me ( :