Ann Marie O

I am working on a wool wall hanging about 45" x 55" in size - actually it is wool applique on "woolies" flannel which is backed with a light weight iron on pellon.

My question is what to use for the backing and batting in the final quilt?

This is the first time I have worked with wool and being the "top" layer is quite heavy I am not sure what to use to quilt it all together. And do I even need a batting (or something) for filler? Maybe just a cotton backing?

I would appreciate any and all suggestions.

Thanks!