To create the hoop layer, two gathered pieces are sewn onto a flat piece of netting, and a casing for the hoop is then created underneath. On the long/right side of the flat piece you can see the zig-zag over gathering threads which will be used to gather
Making a Tutu Step The hoop is inserted into the casting. The size of the hoop helps determine the shape of the tutu -- smaller for more bell-shaped or larger for more flat. Oregon Ballet Theatre: News from the Costume Shop.