Originally Posted by The Caped Knight
Peggy was also a blonde in the comics yet in the film adaptation "The First Avenger" Hayley didn't dye her hair she keep as a luscious brunette and it worked out prefect. so MEW can stay a brunette as well just like her aunt.
It varies. But she was also drawn as a brunette in the comics.
And the movie combined elements of Peggy with Cynthia Glass, who was also a brunette.
I'd sort of want them to keep the blond hair, though its no problem if they loose it.