I usually wear XL t-shirts, but I've seen a few tips to order a size up. I would definitely do it if you're not a "skinny" person. I'm 6ft 0215lbs (athletic/muscular build) and ordered XXL. I definitely recommend it. It fits great out of the box and I think it will have room to shrink after a few washes. It's also super comfortable! Pima cotton is my new option I guess! One last thing - the fabric of the shirt is very thin compared to other brands of premium Pima cotton long sleeve t-shirts (Psycho Bunny is my match)
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