How does somebody steal a tail?

[ He really didn't mean to ask that out loud. Normally he would've kept it inside and just kind of ... ignored this. But he had a compulsion. This isn't good. He stops himself from looking too confused by it and just moves on like it's nothing. ]

I've got some pants you can borrow if you want them. Though you could probably go get a pair you're sure would fit you for free, couldn't you?