Remus was now a little drunk. He was going to be a man and admit this to himself. And because he was drunk, he was feeling a little gutsier than usual.
"If I win, you have to wear one of my cardigans to teach a class, because I know you hate them. And if you win, I'll wear your leather jacket to work."
A silly bet, maybe, but Sirius HATED those jumpers. And Remus couldn't imagine showing up at Flourish and Blotts in that awful, torn up piece of cow hide.