While Snow White wears 2 different dresses, Pocahontas only has 1.
While Elsa wears 7 different outfits over the course of Frozen, Anna wears 10.
Cinderella wears a total of 5 dresses, while Aurora only wears 3.
While Rapunzel only wears 4 dresses over the course of the film, Ariel wears 7 different outfits.
Dressed as a woman and a man Mulan has 7 outfits, Merida only has 4.
Belle has 4 different dresses, Jasmine has 5 outfits.
While Lottie has 7 dresses, Tiana has 11. That's the most of any princess, not bad for a girl who spends most of the film as a frog.