You will need:
- a sewing machine complete with thread
- 2 colors of heavyweight fabric (felt) - step three will explain how much you need.
- nice, sharp scissors
- a yard stick
- something to mark the fabric with (a ballpoint pen will work)
- an iron
And, if you'd like to personalize the cape by putting your name on the back, you will need:
- contrasting fabric
- some sort of double sided fusible webbing suitable for applique - Steam-A-Seam is a popular brand name.