I'm looking at getting a sterlingwear authentic peacoat, but I'm having a little trouble on which size I should get. I'm 5' 7'', 140lbs, 31 waist, and a 37 chest. I generally wear a 38S jacket, but that is a tad long. I asked a rep at sterlingwear and they said to get a 38R. I'm a little skeptical about that and would probably get a 38S, but I would like some insight before I make the plunge.
With the Authentic, I would suggest a 36 to get a more trim fit. If you get an Authentic in a 38 ( assuming a standard P2P) I think it will be larger in the torso than you would like. Going down a size, you may not need a short, but get from customer service the length of the sleeves and the length of the body to make sure.