i did it, and after messing up a few times i found the best way to do it is to do a single loose knot then do a few stitches to secure the know and prevent it to tighten when you wear the headband. The result was pretty similar to Mk, i tried attaching a separate piece to do the knot and place it on top of the headband but it wasnt anything like the one Mk is wearing. Ill try to do a tutorial soon. It looks fab!