I gave this jacket in a medium to my son-in-law. He is a rather small man, 5'9" and 150 lbs, so he usually wears a medium. Overall, this jacket is nice looking, durable, and fits. However, when he buttons the bottom button, the jacket is actually a little too tight there. I think a small would be too small for him, but if he even gained a few pounds, I don't think he would be able to button the bottom button. I guess the jacket just needs a little more room.
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