The theme for this year's recital is Cinderella. All the Cinderellas. So many.
This is a goose hat for the little girls portraying geese/footmen in Tattercoats, an English variant of the story. I wish I could find a picture to show you, but the internet has failed me. Regardless, the hats are based on an illustration for a 1976 picture book version. You are just going to have to trust me that they are a pretty good facsimile.
Many goose hats: