If you want to make a Batman costume for yourself or for someone else, the Batman cape is a vital part of that Batman costume. Making a Batman cape is a bit different than making other superhero capes as the Batman cape has a scalloped, or arched, bottom. However, the rest of the cape can be made similar to other superhero capes.
Measure the person who will be wearing the cape from the shoulders down to the top of the ankles.
Purchase some black or navy fabric to make your Batman cape. Take the measurement you took of the person that will be wearing the cape to a local fabric store or to the fabric department of Walmart and purchase your fabric. Purchase some Velcro squares to make the cape clasp around the neck.
Prepare the bottom of the cape. Lay out your fabric on a flat surface and locate what will be the bottom of the cape. Align a large bowl on the edge of the fabric so half of the bowl is on the bottom of the cape and half is on your flat surface. Using chalk, trace the half outline of the bowl on the fabric. Do this along the entire bottom of the cape to make your scallop design.
Cut the scalloped bottom.
Prepare the top of the cape. Fold your cape in half longways. You should have a long, skinny, rectangular shape. If you have a square shape, you have folded it the wrong way. Once folded in half properly, measure up halfway and make a mark on the side with your chalk. Then, go to the top and measure halfway across and make a mark with your chalk. Using a yard stick or ruler, draw a line with your chalk connecting the two marks and then cut away that fabric. You will be cutting the fabric that is away from the fold; do not cut the fabric where the fold is. This cut will leave the top of the fabric so that the cape lays properly on the shoulders for a flowing effect.
Hem the perimeter of the entire cape using your sewing machine, or by hand if you prefer. The cape will be rectangular with a scalloped bottom.
Add the Velcro to the cape. Follow the direction on the package of Velcro strips. Sew the Velcro on the opposite corners at the top of the cape using a sewing machine. The Velcro will allow the cape to be closed around the neck and to stay in place.