"Oh--heh, well. I didn't have a coat like this until I came here. When I--when I got here--I was dressed for June weather, of course--" He breaks off, laughing at the memory. "--um. It snows in Paris, but not much--"

If he looks like he's about to dart in and snatch at Harry's hat, it's because he is. And run away with it, if he can.