I love Cuarón's cinematography in PoA, but it was the movie where they started drifting a bit too far away from the book canon. I hope we see more traditional wizard robes in the new show.
I mean, weren't they still wearing their robes during class in PoA and later films? Even in philosopher's stone they wear sweaters and pants during christmas break.
Well yeah, its purpose is to indicate that you’ve forgotten something, not tell you what you’ve forgotten. What do you think your spells are for? Or did you forget that, too?