I love Frozen. But I agree it was not the first Disney movie to do all these things. But I do feel like it was the first Disney movie to address all of these things together. It made a point to go against the usual formula of a Disney princess movies and that's what I like so much about it.
If Disney characters wore modern clothing - Cute, but if Rapunzel had bangs, wouldn't they have turned brown?: Modern Princess, Funny Disney Princess, Modern Disney Princess, Modern Clothing, Disney Outfit, Disney Pixar, Elsa, Disney Characters