Hot glue honey. Use very super thin foam board and hot glue everything on it. My friend bought one from a lady yesterday so we could see how it was made. We used my niece as an excuse.
It's expensive $25!!!!! We traced the body form and all she done was make a template out of posterboard. Use that to cut out the foamboard and material. Hot glued material on the top. Glued a piece of ribbon on the bottom where the tutu goes. Added a row of small bows along the bottom with hot glue. Then hot glued the tulle. HTH.