How would you get this shape of cake?

Bake and torte three size cakes ex: 4,5,6 inch chut each one in half. Use one of each half to stack from the bottom up 6,5,4 then 4,5,6. Don't forget the proper supports and dowels to kepp it from collpasing.
this was just an ex of cake sizes you can use. You can bake different sizes accdoring to how many people you want to feed. My corset was done like this. It's in my photos if you want to look. Good Luck!