Slim Fit shirt: the Cut is Smaller than the Regular American Size. We recommend buying 1 Size Up. Example: if you are a size L in a Non-Fitted American sized shirt (Gap, Banana Republic, Robert Graham etc.), then you should select a size XL. Shirt has a slightly more room in the belly area than the Slim Fit shirts. Size chart for this St-Lynn shirts
Model measurements: 5'11" height, 39" chest, 30" waist, and is wearing a size M.