Donna Troy will change her costume (and powers) every once in a while, although this is very rarely symptomatic of her becoming evil, but rather because of the writers becoming evil: Donna Troy's history was so convoluted and tragic that they actually made it canon that her existence consists of countless lifetimes of suffering through multiple universes.
Because, as the example admits, her costume changes have nothing to do with the trope.
Removed:
Because, as the example admits, her costume changes have nothing to do with the trope.