Step 2: Adding the heel
The first piece that you want to add, is the heel. By now, you should've already created your shoe patterns, and transferred them to the suede. It really does not matter how wide the sides of this piece is, as it will be later covered by the front piece. What does matter is the arched shape above the heel.

Simply add a layer of cement to both the inside of your suede heel, and the heel of the shoe. Remember, rubber cement is a contact glue. So let it dry a few minutes before sticking them together.