That’s a good idea - or maybe a child sized sock 🤷♀️
Whatever you use, I suggest getting something close to the color of the feathers so the other chickens don’t peck at it
I had a chicken that had her entire back scalped by a dog - from the base of her neck all the way down to her tail feathers. Completely skinned with muscle showing. I didn’t think she would make it. I kept it sprayed with blukote for a month and kept a hen apron on her.
She never did grow back...