I am about to use the tulle material on a quilt DH's mom made for our daughter nearly 50 years ago. some of the material near the center are wearing through. Your main concern is to stop further deteriation. Back when it was made they used the type of cotton filling that tends to seperate and go to pieces. by using the tulle, you can cover the parts that are going so the filling won't come out, and still be able to hang them over a quilt rack or folded up. What ever you do, don't try to use new cloth to patch. Jesus said, no one puts a new patch on old cloth because it will make the tear worse. Who am I to question that?