Model is 5' 10"/ 178cm and 136lbs/ 62kg. He wears a size 38. Please use this info as a general guide as measurements are approximate. Size Shoulder Chest 36 18.1" / 46cm 42.9" / 109cm 38 18.9" / 48cm 44.9" / 114cm 40 19.7" / 50cm 46.9" / 119cm 42 20.3" / 51.5cm 48.8" / 124cm 44 20.9" / 53cm 50.8" / 129cm Size Length Sleeve 36 24.4" / 62cm 23.2" / 59cm 38 25.2" / 64cm 23.6" / 60cm 40 26" / 66cm 24" / 61cm 42 26.8" / 68cm 24.4" / 62cm 44 27.4" / 69.5cm 24.8" / 63cm 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. **