How do you know what fitting your horse is. Star came with her saddle and although its a very nice saddle, its quite forward cut, and her shoulders are quite straight. I know that I could get a saddler to come and measure her, but I'm just playing with the idea in my mind, and want to know what size to consider. Exactly how wide is Xwide. She is a 6yearold 14.3 1/2hh cob, MW at the moment, but still growing I think. She has grown an inch and a half in the last year.