
This is 3.5 mm wide pure silk ribbon, very light and airy. A nice thing if you need shoulder straps for a reconstruction of this garment:

Or a light, fine drawstring. Or a ribbon to bind and decorate your hair. Or whatever else you can think of. The ribbon comes in 5-metre pieces, but should you need more in one piece (or just more), I can wind off (almost) whatever length you desire.
Picture source: Bartz/Karnein/Lange: Liebesfreuden im Mittelalter. München 2001. P. 25.