(If you are using regular tulle, also try to cut along the edges of the pieces where the threads join, otherwise you end up with thread «legs» sticking out, rather than a neat edge) If you gather the veil in
a semi circle shape, it will pull into a rounded shape and the edges will meet up with the sides of the hat.
Using a square (a),
semi circle (b) and rectangle (c), these
shapes are placed together or taken away from each other, the students are to give expressions for these.