"What do you need boy robes for?" inquires Madam Malkins.
"I'm sometimes a boy," the girl explains.
"What?"
"Look—"
"Because magic exists and I'm going to school with a ton of people who've known about it all their lives and there's a whole different world? – And also apparently electricity doesn't work. For some reason."
"It's what I heard. I assume we don't need lightbulbs, though, what with – I dunno, flames of never-going-out?"
"Uh. Magic interferes with it somehow? I'm not sure. You have, uh, computers, right? Computers use electricity? They don't work near magic."
"Or you could just say it sounds Ravenclaw or Slytherin. Without the ish."
"… If it's called a restricted section, it's probably, y'know, restricted."