What a great solution!
Thanks for starting this thread. I made a King quilt for our bed but somehow made it too small and we are constantly pulling on it.
I think I can fix it, thank you!
Isn't it frustrating?
I once made a rag quilt of flannel and had the same problem. In that case I just sewed a large border around it and it worked. Not too pretty though.
I'm currently making a Log Cabin for the same bed and you can be sure it's going to be big!