Originally Posted by CloverPatch
I can't help you with items to permanently sew in.
I have always made a sleeve to put matboard in. i remove it to wash ofcourse.
I do as Clover Patch does and use a very heavy mat board. I make a sleeve for it so it can be removed for washing. You can find mat board in the framing or art department of Hobby Lobby or Michael's. I also sometimes use plexiglas. Lowe's or any home store will cut it for you.