One of the many people at serolynne's party, james_the_evil1 brought rope. This should come as a surprise to nobody, really. S volunteered to be tied up, so I tried an experiment with incorporating her hair into the tie.
This is a two-layer harness, which looks deceptively simple from the front:
From the back, it's a bit more complicated, though. I think it worked well; I like the asymmetry.