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,
Shop Men's Carhartt Big + Tall | DXL
Carhartt Men's Duck Detroit Jacket (Regular and Big & Tall Sizes) | eBay
Big and Tall - Carhartt - Work Jackets & Coats - Outerwear - The Home Depot
Amazon.com: Carhartt Men's Storm Defender Loose Fit Midweight Utility Jacket, Black Brown, Small: Clothing, Shoes & Jewelry