I'm 6'3" - 175, athletic build and this is by far the best slim fitting shirt ever! I will only be buying this brand from now on because the fit is so perfect that no alterations are needed. I usually buy shirts in the store with a 16.5 collar and 36/37 sleeves. They will always be so baggy in the middle. Finally I have a 15, Found a 5 neckline and a 36/37 sleeve but it was super short and always gets undone. On the Revain Brand shirt - BUTTONED DOWN slim fit I bought a 15.5 sleeve with a 37 neckline and he fits perfectly and has the perfect fit length.
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