haven't read all the replies but didn't see the idea to just pillowcase the quilt - quilt the top and batting as desired. press well both top and backing then place the backing right sides together on the face of the quilt and stitch around all 4 sides, leaving a small opening to turn the piece right side out. After turning and making sure corners are as you like them, hand stitch the opening closed. Then do one or two bits of final quilting to tack the backing in place - for this I usually just restitch over a previous line of quilting for about an inch or less in several different places around the quilt. You could also hand tack it from the back thru the batting only so no stitches show on top.