Slim fit. The Cut is Smaller than the Regular Non-Fitted Shirts. We recommend buying 1 Size Up. Example: if you are a size L in a Non-Fitted shirt (Gap, Banana Republic, Robert Graham etc.), then you should select a size XL Size chart for this St-Lynn shirt Model measurements: 5'11" height, 39" chest, 31" waist, 16" neck, and is wearing a size M.