I bought the spools of tulle and ribbon from Michaels. Eb's tutu consisted of 1/3 roll of wide ribbon, almost 3 spools of tulle (3 different colors) and a small thing of decorative ribbon.
Instructions: Look up on Youtube... I might make a video or a step by step post later but this was my first time making it. I did the no sew method.
Tip: Don't use glitter tulle. It may look really cute but the entire house has glitter all over. Another tip... make slightly shorter if the child is crawling.