This is the $25 Justice League Movie Batman Chair Cape available exclusively from Entertainment Earth at this year's San Diego Comic-Con convention. If supplies remain after the convention, the rest will be shipped to the first people who tried pre-ordering online. Am I going to get one then sit at my desk yelling "I'M BATMAN" every time somebody asks a question? I don't know how I couldn't. First person to ask how my parents are doing gets a BatStapler to the neck though.
Thanks to C, who agrees the coolest capes have been, and always will be, wizard capes.