In this tutorial I'll show you how to make a Mad Hatter's Hat Cake Topper. It can be used as a decoration or a top tier. If you want the hat to have cake inside, simply substitute the polystyrene with cake.
9.
I used the scalpel handle to texture the area near the bottom edge.
Leave the dummy to dry. Best overnight. The paste needs to be firm so that you don't damage the shape.
If you are making a cake don't leave it to dry. Follow the next steps, but be very careful not to damage the shape.