Model - 5' 8", 160lbs / 173cm, 72.5kg. Size 40. Please use this info as a general guide as measurements are approximate. Size Shoulder Chest 36 19.7"/ 50 cm 43.3"/ 110 cm 38 20.5"/ 52 cm 45.3"/ 115 cm 40 21.3"/ 54 cm 46.9"/ 119 cm 42 22"/ 56 cm 48.8"/ 124 cm 44 22.8"/ 58 cm 50.8"/ 129 cm Size Sleeve Length 36 22"/ 56 cm 22.8"/ 58 cm 38 22.4"/ 57 cm 23.6"/ 60 cm 40 22.8"/ 58 cm 24.4"/ 62 cm 42 23.4"/ 59.5 cm 25.2"/ 64 cm 44 24"/ 61 cm 26"/ 66 cm In order to best determine fit, it may be helpful to compare our garment’s measurements to a similar garment you already own. Lay your garment on a flat surface and take all measurements from the outside of the garment. Click here to check out our Garment Measuring Guide. ** If you are still confused, you can Contact Us to help you choose the size. **