Model Height Weight  Size 1 5' 7" / 170cm 143lbs / 65kg 36 2/Shown 5' 10" / 178cm 160lbs / 72.5kg 38 3 5' 10" / 178cm 165lbs / 75kg 40 4 5' 11"/ 180cm 176lbs / 80kg 42 5 5' 10" / 178cm 194lbs / 88kg 44 Please use this info as a general guide as measurements are approximate. Size Shoulder Chest 36 16.9" / 43cm 34.6" / 88cm 38 17.3" / 44cm 36.6" / 93cm 40 18.1" / 46cm 38.6" / 98cm 42 18.5" / 47cm 40.6" / 103cm 44 19.3" / 49cm 43.3" / 110cm 46 20.1“/ 51cm 45.3" / 115cm Size Length Sleeve 36 24" / 61cm 5.9" / 15cm 38 24.8" / 63cm 6.1" / 15.5cm 40 25.6" / 65cm 6.3" / 16cm 42 26.4" / 67cm 6.5" / 16.5cm 44 27.2" / 69cm 6.9" / 17.5cm 46 28.7" / 73cm 7.1" / 18cm 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. **