Check out this tutorial.
http://www.quiltingboard.com/tutoria...lt-t60764.html
Also go to Quiltville and watch Bonnie taking a mans shirt apart. I grew up with string quilts. They were a necessity for warmth on the beds. It was just after the depression and world war 2. I am sure fabric was hard to come by. I don't know if mom's strings came from sewing, as she sewed all our clothing, or old clothes that she salvaged the good parts from. They were pieced on newspaper squares. Even though I grew up with string and scrap quilts I still love the look of them. Have fun and get your strings anyway you want. You will probably have more than you can use coming your way.