For the record, I'm 5'8", 165 lbs, athletic build. I ordered a small, incredibly comfortable shirt. The fit through the chest, shoulders and arms is fantastic and very flattering, but the shirt below the bust is for too wide for my liking. Maybe it's just style. Guys with a little more in the middle might like this shirt so they can show their guns without showing their bravery. Also, the zipper on the sleeve is functional but it's not enough room to put something there.