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Hmmm.. looking at a website that sells them, it might not fit me. Here's the Neosport size chart for a 7mm Farmer John and Jacket:
Mens.......XS.......SM.........MD........LG..........XL.......2XL........3X
Chest....34-36...36-38.....38-40....40-42.....42-44....44-46....46-48
Waist....29-31...31-33.....33-35....35-37.....37-39....39-41....41-44
Weight.125-135.135-150.150-170.170-190..190-210.210-230.230-250
Height..5'5-5'7...5'7-5'9...5'9-5'11.5'10-5'11.5'11-6'...6'-6'1.....6'1-6'2
Kind of a toss-up. By chest and waist size, a LG should fit me. By weight, I should go up to an XL. By height, I would need a 3X, but that would likely be too big in the chest and waist.
I'm closer than when I was 17 years old. Back then, I would have needed an XS for my weight, while still needing a 3X for my height. When I joined the USAF at 17, I was 6'2" and 108 pounds.