This is just my opinion, but with todays cost of everything and a lot of us who are on a limited income, you cannot go wrong with flannel. It is snuggly warm, easy to sew, and you can find lots of it at any goodwill, thrift, or yard sale. I choose flannel over the traditional batting anytime. I just like it alot. Old used wool army blankets make a good batting too, and is sooooooooo warm. But with anything you buy used, be sure to clean it, even if it already looks and smells clean. Granny always use to say an ounce of caution is worth a pound of cure. Happy sewing everyone:-)