This maker of this quilt tries to explain:
"I used batting that my sister had made from her own sheep's wool. I washed it because it smelled "sheepish." It was medim suze when I made it and small after I washed it! Talk about bearding! I have no idea how all that batting got from the inside to the outside. (This is NOT a biscuit quilt, by the way!)"
If only sheep's wool was made out of polyester this would never have become such a problem.