I like the idea of her not having a "good guy vs bad guy" costume.
Depending on her break with her past life, and feelings about her past, and the artificial nature of such, being a clone and all, it might be that she would keep her old costume.
It's familiar, after all. As well as recognizable. If she's in any way pretending to be the original, who IIRC is MIA, then that let's everyone else go, "What's she up to, what happened to her?" That might make the players much less likely to assume clone/copy/evil twin, and more likely to think mind control/gone rogue/in circumstances they don't understand.
Of cource, from comics and movies, when the good girl goes evil, she gets a much ... sluttier costume. It's a tradition.
D