My coif is made of linen and I used a double-layer of stiff "cotton-linen" canvas to stiffened the forepart. Contrary to what everyone does, by adding the stiffening band only from ear-to-ear, my band goes all around my head and joins in the back. That's why I designed it smaller at the tips. But if the knot concept doesn't work, this would mean that in period, it would have been pined, not tied ; So I'll be trying it both ways and I'll cut off the excedent if the pining technique works best. The canvas piece isn't quite placed in the middle because you have to take in consideration that only the outer layer will be pleated and therefor, must be about 5 inches longer than the inner part.