Sizing is messed up! I'm 6'1” tall, 203lbs, with a 42.5” chest, 37” natural waist, and 34.5” sleeve length (dress shirt measurement). So, I follow the size chart for the Chore Coat,
Size Chart for Carhartt CTT103828 Tall Duck Detroit Jacket - A2ZClothing.com
Size Chart for Carhartt CTSJ140 Quilted-Flannel-Lined Duck Active Jacket - A2ZClothing.com
Carhartt Duck Detroit Jacket Brown Size Men's Small- 2XLarge CT103828 chose size | eBay