(out-of-print) is basically a dress with a tulle "bag" overlay into which you place flowers, etc. before stitching together. Here's a homemade version:
I've sewn many tulle-covered dresses, but [disclaimer] never made a tutu, so maybe there's a method out there, but... I don't see how knotting tulle strips could be possible here. Sewing yardage does appear to be your only option. Also, I don't see how you can do it without some kind of a lining because the tulle would be unbearably itchy at the waist. The example above uses a onesie for that purpose.