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Does Clark Kenting or Paper-Thin Disguise cover situations where someone doesn't have a secret identity, they just look completely different in some situations than others? For example, Dolly Parton is apparently unrecognizable when she wants to be, by just taking off her blond wig and makeup. In some cases they may not even be consciously changing their appearance, or it may be magically tied to a certain location (i.e. if they leave a certain area they look completely different).
The example that made me wonder if this exists is Seiichi Tsukishima from The Story Between a Dumb Prefect and a High School Girl with an Inappropriate Skirt Length, who's a Bishōnen inside the school library, but turns into a Gonk as soon as he steps over the threshold.