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.

1.

Use the 88 mm round cutter to trace a circle on the dummy. Make sure it's positioned in the middle.

There's a separate post about polystyrene & food safety here.