The first layer of shirts is painted in watercolor than placed on top is a circle made of acetate. Painted on the acetate in gouache are the ties. Holding the two pieces together are those things you use in the punched holes of reports to hold them together. So the top layer of acetate can spin around on top around and vary all the ties with each shirt. Like this handy .gif demonstrates...
If you click on the image, it will move.
































