Hi all - I know nothing at all about horses but am hoping someone might be able to give me some advice! DS has been learning to ride for a while now and is apparently to be promoted to the "big school" and needs a body protector. I've measured him (chest 55cm, waist 51cm, waist to waist over shoulder about 66-68cm, back 36 cm. Have managed to confuse myself looking at online websites, as they have a wide variety (and sometimes inadequate) sizing info.. I know it needs to fit properly but unfortunately there isn't a real life store convenient to us, and I don't drive... anyone have any suggestions based on experience? Also are some brands notoriously better than others?