Purchased for my boyfriend. He has a 40 inch chest and is slimmer through the stomach. With the measurement I went with the large hoping it would be roomy enough to have something on thicker underneath. It was perfect for him in the shoulders and had enough room to have something underneath while still being form fitted and flattering. We are so happy with the purchase!! The quality of the jacket and its lining are great! The outside material is softer than most peacoats usually made of wool. We'll see how the outside holds up in Chicago winters. Really warm seeming with the hood, lining and double layer dickie.