the kids who are wearing robes were taking their OWLs/NEWTs. Notice Luna’s not wearing a robe either. Because they’re underclassmen and had free periods while the upperclassmen were taking their exams.
This post is amazing because a) Slytherin and intrahouse love, but also because b) someone just explained how free-dress works during exams at Hogwarts.
we take our harry potter very seriously here at tumblr dot com