If you take size SL they fit loose (so take a size down) if you take size XL and they are bigger I'll sit tighter (go up a size). I have read many conflicting reviews about sizing and have come to this conclusion, although I may be completely wrong. All I know is that I'm usually average in jackets and based on the reviews I've read I've decided to try small ones and they fit my body type just right. I'm 5ft 6", 185lbs muscular, a little paunchy, I wear ML shirts and usually medium sized jackets like this but the little ones fit perfectly.
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