being the mother of a 5 year old - it only gets worst!!!
she changes her clothes less, but for a good year she would only wear dresses, and would break down in tears when she had to wear pants. this winter, after buy her all dresses skirts and warm tights in the faill, she decided she only wanted to wear jeans.
it's a never ending cycle!! i would just let her run her course, and perhaps only keep so many outfits in her reach. you could also try buying her dress up clothes to keep her busy like darlene already mentioned!