This is a very stylish jacket and serves the purpose that I intended it for which was a light spring jacket that can be dressed up or down depending on the situation. Being 5'8" 175 pounds with a 44" inch chest and a 31" waist the reviews were hard to decipher choosing between the medium or large sizing. So I purchased both sizes so I could compare. Being built the way I am here is the reason why I kept the medium and sent the large back.Regarding armpit to armpit distance, it was only about a 0.5-inch difference. Large being about 23" and Medium being 22.5". Same for where the arm seam meets at the top of the shoulders. Large being 18" and medium being 17.5". What this means for someone with a built upper body is that you will feel very little difference between large and medium regarding tightness in the chest, back, shoulders while wearing the coat. Even in the overall length between the Large and Medium when I measured they were 27" and 26-26.5".The main difference was in width at the bottom of the coat. Large being about 20.5" right above the elastic band and Medium being 18.5."On my body, the medium looks slim and streamlined. While wearing the large you could not tell if I was lean or had a gut. So if you do have a little bit of a belly, the large will do a good job of hiding it. Because of the tightness across the back and shoulders for guys who workout do not expect to be doing pullups or cage matches in it. However, if your looking for a classically styled jacket to go out in that can also show off the physique, this is an excellent choice.Overall the coat seems to be well made and very comfortable to wear. Arms are a tad tight if you work out. Anyone with arms over 18" is going to have issues with sleeve size. For the price, this coat is of great value compared to some of the Harrington jackets or bomber jackets I have tried on. It also does an excellent job at preventing printing from a weapon if you are a CCW carrier without sacrificing style. Just understand that it is a shorter styled jacket so bending over to tie a shoe or reaching up for something might reveal what you're "packing."