Model is 5' 10"/ 178cm, and weighs 159lbs/ 72.5kg, wears a size 38. Please use this info as a general guide as measurements are approximate. Size Shoulder Chest 36 18.1" / 46 cm 41.7" / 106 cm 38 18.7" / 47.5 cm 43.3" / 110 cm 40 19.3" / 49 cm 45.3" / 115 cm 42 19.9" / 50.5 cm 47.2" / 120 cm 44 20.5" / 52 cm 48.8" / 124 cm Size Sleeve Length 36 23.2" / 59 cm 26.8" / 68 cm 38 23.8" / 60.5 cm 27.6" / 70 cm 40 24.4" / 62 cm 28.1" / 71.5 cm 42 25.0" / 63.5 cm 28.7" / 73 cm 44 25.4" / 64.5 cm 29.3" / 74.5 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. **