DESIGN WALL FABRIC

Maggie requested help from other quilters.  Perhaps you can help her find the fabric she desires for her Design Wall.
I am looking for a heavy weight cotton flannel to cover a design wall. I found a source that sold pressing flannel which was double napped cotton flannel but it no longer carries the product. I used it to make a large pressing table. The flannel formed a beautiful cotton barrier before being covered by cotton duck. Does anyone have a source for such a product? Thank you.
Do any of you have information to help Maggie?
(Amazon image)