I always wear a size XL on a 100% cotton t-shirt or henley, but this one is too big. That being said, I believe Carhartt is the only one that's the right size. At barely 6 feet and 205 pounds, I should be considered tall, not very tall. So I think just order one size smaller than your t-shirts and they should fit. This is a quality shirt and deserves 5 stars although I gave it to my brother in law and had to order another in the right size.
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