Batman Costume Latex Cape Movement and Flow 

I have improved the design and texture since making this video. Here is my new Etsy shop:
etsy.me/32H2TdH
This is the final product of my self-made latex cape. It is approx 11' in diameter and roughly 5-6lbs. There are 8 panels of fabric sewn together in the same pattern as the 1989 Michael Keaton Batman. The panels were then coated with 2 layers of latex on both sides.
I'm 5'10" to give you an idea of length. It is very, very durable and can give your suit the perfect final look. I've worn latex capes in my appearances as Batman and it is always the center of attention. Most people have never seen anything like it.
Try to ignore the cicadas. They're out this year.