He nearly replied that he always sleeps in the nude (when he sleeps), but given that she's going out of her way to talk about bed clothes, he somehow thinks better of it. Plus, sleeping with Rey naked next to him would be a sort of torture, right now.

"That was the idea, yeah." What else would he sleep in?

And since she had originally asked for somewhere to change, he assumed she'd been asking for privacy, and he turned his back as she did so. Of course, this was their realm - he could see any corner of it at any time, if he wanted, so it also required trying very hard not to think about the fact that she was changing near him. A little harder to do.

When she spoke, he turned back around.

Oh, huh. That was new. He frowned a little bit, and then a second later he was in a pair of pyjamas himself - black silk with those same weird mirage patterns in blood orange at the hems.

"This better?"