A YouTube video on how to stretch silk cocoons, and then how to knit with them. To be honest, I wouldn't tug like that if I was going to knit, I would use the same technique as I do to spin, but I'd probably start with 4 or five layers instead of trying for one.
Up until the moment I saw this video I honestly believed that hankies were prepared in a way that did not kill the pupa. Processing. Processing. Processing.