Anytime I see Superman Cape Stashing discussion, I have to poke my head in to mention how back in 2005 I dressed as Supergirl for Halloween at my office and managed to fit my entire costume underneath a business suit, including the cape (and "boots," I cheated by using those stretch fabric stockings that look like superhero boots). Granted, a Supergirl cape will have less fabric, but my technique was to carefully and tightly roll the bottom of the cape upwards until it reached my waist, then tuck the tube around my waist beneath my trousers along with my blouse hem (of course, part of the trick was taking into account that my pants size would need to accommodate that extra bit of bulk at the waistline, but that wasn't an issue for wider-leg business trousers; it didn't look disproportionate or too baggy). When I "stripped," the cape just unrolled, no problem.
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