I have made several flannel quilts. Usually a pieced flannel top, flannel backing, and 80/20 batting. Good idea to prewash the flannel unless you really want the crinkle look. Flannel usually will shrink quite a bit. I use good quality flannel which doesn't usually shrink as much but I once did a so-called bargain type flannel on a scrap flannel quilt I did. I wish I hadn't, although I had prewashed it, it shrank again when I washed the completed quilt, and it pills. No problems with quilting them on my APQS Lucey.