TP definitely seems to have gotten the most detailed responses from Patrizio. But he has answered most of my questions, as long as I've been persistent, confirmed what I've wanted done, and asked him to send me a PayPal invoice. I would be concerned about the fabric pulling on itself internally while knotting it. It seems like some interlining would alleviate that friction. But it's also likely that I'm making up a non-existent concern.