A cape could only be practical for a street-level hero in comic books, where they can somehow assist in stealth (Despite the fact that it makes your overall frame larger and that it sort of, you know, catches wind and air), can be used to conceal solid weaponry, be thick enough to pad blows from superhumans, be lined with lead making it radiation resistant, and, despite all of these traits that would make your cape too cumbersome, heavy, and frankly much more akin to a large greatcoat than a cape at this point, still light as a feather, incapable of hindering you when performing physical tasks, and even allowing you to ****ing glide.
Operating under comic logic, whether or not you have a cape means shit in terms of what is practical. Only your popularity with the fans/writers does.