Let me give you some examples for inspiration
Some of our princesses have two outfit changes in their film, but when it comes to Ariel, she is seen in six different outfits throughout the 1989 film (if you dont count her pink nightgown)
When Millie Bobby Brown isn't donning clothing from her own label - Florence By Mills Fashion - that defines cosy-cool, she's wearing It-girl-coded evening outfits which, this season, include plenty of black outfits with a mini hemline
McCardells pivotal Pop-over dress, which was originally introduced as a $7 Utility garment in 1940, marked the beginning of American sportswear: easy, practical, yet uncompromisingly stylish
Grape: Rich and saturated with a warm, berry-like depth
If you are planning on getting the students of your school involved in dress up days, keep in mind that many students will not have the means to add items to their wardrobe simply to participate in a school dress up day