I purchased some saddles for a hen that had the same problem. The saddle seems to be working well for our hen. She wasn't crazy about it at first, but she's gotten used to it and doesn't seem to notice it anymore. It had the added bonus, for awhile, of discouraging our rooster from breeding with her (he slipped off) but he's figured out how to get around that now, so her wing roots still look a bit tattered, but her back is slowly getting new little pin feathers.
Our rooster, a Rhode Island Red/Americauna cross is extremely nice and never deliberately tears up the hens, but the hen is a cochin bantam half-breed and a lot smaller than he is. Problem is, she adores him and stays right next to him all the time, no wandering around like the other hens, so she probably gets more attention as well as being smaller.
Here is the Backyard member I purchased my saddles from:
https://www.backyardchickens.com/forum/viewtopic.php?id=131065
She charged me $3.00 per saddle, with minimal postage. They were sturdy materials, backed with a smoother inner lining, flat and very well made. My only complaint is that the fasteners under the wings (elastic with snaps) don't look terribly comfortable. My hen doesn't seem to be bothered so far, but as soon as I can find someone with a working sewing machine, I'm going to make some tubes of softer material to slide over the elastic.
If you search the forums with the term "chicken saddle" you'll find lots of people who have patterns or instructions on how to make a quick saddle out of scraps you may have at home. One person used felt and just cut wingholes and a tail hole through the felt. That would probably work too.