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 17.4" / 44.3cm 42.5" / 108cm 38 18.1" / 46cm 44.1" / 112cm 40 18.8" / 47.8cm 45.7" / 116cm 42 19.7" / 50cm 47.6" / 121cm 44 20.3" / 51.5cm 49.2" / 125cm 46 20.9" / 53cm 51.2" / 130cm Size Length Sleeve 36 23.8" / 60.5cm 24" / 61cm 38 24.4" / 62cm 24.6" / 62.5cm 40 25.2" / 64cm 25" / 63.5cm 42 26" / 66cm 25.6" / 65cm 44 26.6" / 67.5cm 25.9" / 65.8cm 46 27.2" / 69cm 26.4" / 67cm 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. **