quite a few years ago i got a book out of the library on how to make 'horsewear' . It was very good and i made a few numnahs, saddlecloths and even a couple of fleece travel rugs!
tbh the price of material today and the prices of ready made items in robinsons catolouges etc i think its not worth making them anymore. but if you are bored and want something personalised its worth a go. you can probably still get the book but i can't remember what it was called. it was in the horse section though.