Attention, dear readers: I need your assistance. I'd like to compile a photo collection here: girls dressed up as superheroes. It's no fair to give all the cool superhero toys to boys and then teach girls it is better for them to be princesses.
If they prefer the pink stuff, cool. That's the point: they should get to decide what is for them. But other than Wonder Woman, who is still being ignored by Hollywood in favor of much less-popular male characters (did we really need a movie about Green Lantern?), the few major female characters are just afterthougts based on the men. And those sidekicks never solve the big crimes at the end of the story.
Wanting to dress up as Batman makes them no less of a little girl than wanting to dress up as Cinderella. And I'd hate to tell my daughter she couldn't save the day because she's not a boy. So if your daughter/niece/next door neighbor's little girl loves to put on a cape and save the day, send me a photo. I'm collecting them to run on a Flickr page.