Model is 5' 10"/ 178cm and 174lbs/ 79kg. He wears a size 40. Please use this info as a general guide as measurements are approximate. Size Shoulder Chest 36 Free 41.7" / 106cm 38 Free 43.7" / 111cm 40 Free 45.7" / 116cm 42 Free 47.6" / 121cm 44 Free 49.6" / 126cm Size Length Sleeve 36 28.7" / 73cm 23.2" / 59cm 38 29.5" / 75cm 23.6" / 60cm 40 30.1" / 76.5cm 24" / 61cm 42 30.7" / 78cm 24.6" / 62.5cm 44 31.5" / 80cm 25.2" / 64cm 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. **