|I searched the database and I didn't see anything like this, so I think it's new (new to me!).
I couldn't find the length of cotton cord that the Kwik Sew pattern instructions called for to sew and turn the teeny-tiny neck loop, but I did have a leftover length of quarter inch silk ribbon for silk ribbon embroidery in the drawer.
It worked great - thin, strong and really slippery for pulling the loop through on itself. I'll be using it for loops from now on...