I sewed the binding on the usual way: opened up one side of the tape and sewed it to the right side (outside) of the skirt edge. As the material was gathered from the elastic I had to pull the skirt fabric out under the binding tape as I sewed, pull and sew, pull and sew, all the way around. Then I flipped the binding tape to the inside of the skirt and sewed it down, again pulling the fabric as I sewed. And there you go, one encased edge. Tricky? No, not really.