I just washed and dried my very first flannel quilt today (flannel front and back) and for batting I used Pellon Legacy 100% cotton which was recommended by my LQS since I had no idea what to use either for a flannel quilt. She said it drapes really nice and it does. I did not prewash any of the flannel and it only shrunk 1 inch from each side of the finished quilt so I was beyond thrilled!