My Chest size is a 40, im 5'8 185lbs, and the size guide states L = 49 so I ordered a large and it fits perfect and the quality of the jacket is awesome. Also, the design was right on point with no complaints, fast shipment, and I'm in love with jacket and cant wait to show it off with friends. Finally, I shared a few pictures of the jacket and they said they're ordering them one soon and I'm ordering another one soon myself.