The Doctor was still rather shocked as she gave her explanation of a portal, but a grin spread across his face none the less. He knew it was possible to go from one universe to another, he'd been to alternate dimensions himself, but he didn't know they could be used to bring someone back.
He felt like he should have known that, really.
"I... Yes. I rather liked those sleeves at the time, but now I think they were rather pompous looking. And they would get snagged on all sorts of things, like my old scarf. Might as well not wear something that just slows you down." Not that the long trench coat was much better, but he could always tell himself it was.
And then he really looked her over for the first time. "You're ginger! Well that's not fair. I wanted to be ginger."