Harry looked up and saw, floating twenty feet above them, Peeves the Poltergeist, a little man in a bell-covered hat and orange bow tie, his wide, malicious face contorted with concentration as he took aim again. (p172, Harry Potter 4, US edition)
Would you get some specific picture from ‘a bell-covered hat’?
A flop hat, like a bellflower?
A clown hat, whose every horn has a small bell on its tip?
A strange hat, which is encrusted with bells?
I’d be happy if you could give me the right image of the hat.