I've been making them for a short while and I tie them. I've also seen others where they do a square knot. I tried one with square knots and I'm not sure if I like that method or not. When you tie the knot do you leave it on the side of the elastic or do you make the knot go to the bottom. Seems like the tulle around the elastic band doesn't look as nice as when I do the tie method. Is there a way to sew it after you have tied it? I noticed on some of my daughters that the tie comes loose a bit and I would hate for it to come apart for a customer.
Here is one that I just made.