To attach it to the foam core, I used office clips to hold the batting and "quilt" at the edges and took yarn threaded onto a needle and sewed back and forth across the back, catching the top and bottom edges first, then the side edges. After that was completed, I added button "tufting" at each corner of each piece, bringing the thread through the foam core and tying off the ends.
close up of fabric quilt for back of armoire |