Well, an angel costume in a Cinderella story typically incorporates elements like a long, flowing gown, maybe with sparkly details. Wings are a must-have, often big and fluffy. And a halo or some kind of headpiece to complete the angelic image.
The angel costume for Cinderella could feature a lot of things. It might have a fitted bodice and a full skirt. The wings could be made of feathers or fabric and could be attached in a way that makes them look like they're part of the costume. There might also be some jewelry or gemstones for added sparkle.