5ft 9in 185 lbs size small. I actually think you'll be fine as long as you stick with what you normally get. The sleeve length of XL fits me but I'm afraid that changing to medium or L will make them too short for the price not worth sending back so I'll order a smaller size and see what happens.
AM Fitted T Shirt 3 Pack for Men's Clothing - T-Shirts & Tanks
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