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If there are a pair of Half-Identical Twins, both of whom look very androgynous, and often employ cross-dressing as a means of confusing people, would there be a specific trope for this?
Not as such. I think it might be Too Rare To Trope, but perhaps not.
Examples currently would fall under Wholesome Crossdresser / Creepy Crossdresser and/or Disguised in Drag / Sweet Polly Oliver. Perhaps Raised as the Opposite Gender would apply in some cases.
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How well does it match the trope?