It would depend on the quality of flannel.
Chamois type of flannel - like in some of the Eddie Bauer shirts - wears for a long time.
Flimsy, loosely woven flannel - probably would not survive hard use very long.
I think using wider binding (1/2 inch or so finished size) would make it easier to miter the corners.
Last edited by bearisgray; 10-10-2020 at 07:52 AM.