I'm watching "Harry Potter and the Prisoner of Azkaban" right now, and I just noticed that Mr. Honeyduke is wearing a kilt (when Harry comes up out of the tunnel into the sweet shop.) It's fleeting, and hard to tell, but I'm pretty sure he's kilted.

(Edit)

And I just noticed, when Harry comes out of the Leaky Cauldron, a kilted man walks by.