Get them to fit u in stables and then go to Tesco if its cheaper. Their jodphurs are excellent I had some for my foster daughter and went back and got myself some. If the hat feels comfortable and u can put your head upside down and it stays there without falling off u should be ok anyway. Then u can adjust chin strap to feel comfy. Well have to watch out for u at Hickstead lol. Did they mention body protectors cos these u should have fitted properly and they aint cheap but v worthwile