I would really appreciate the professionals' opinions on this sport coat. It is a size 40R which is about what I normally take. My chest is closer to 41 but all of the suits that I have purchased have generally been a 40R. For reference the edge of my acromion process is right at the shoulder seam. I've never had the best of luck finding a perfect fit and "the shoulder's shouldn't extend past your natural shoulder" has never been of any real help to me. It seems to me that the width of the shoulder in regards to a good fit will also depend on how much room is in the sleeve to accommodate the size of someone's deltoids. I have a 42R in route and I plan on taking both to my tailor to get his opinion as well. I suppose that I should note that the thoracic portion of my spine is almost entirely straight and as a result I have very prominent shoulder blades. In addition a separated shoulder has resulted in a half-inch drop of my right arm. They aren't the best pictures so I will post better ones if needed.