Magic Skirt
The odd local laws of physics which apply to a (super)heroine's Dangerously Short Skirt which cause it to always cover everything regardless of what ridiculous things she may be doing, like falling legs first or hanging upside down. Note that the skirt always conceals the girl's modesty from the audience's point of view (onscreen characters may be clearly in position to get an eyeful) and thus acts as a form of censorship. In Japan it is known as an "iron skirt" due to its uncompromising and impenetrable defense.