In contrast to Loki's scowl and very clear dagger-death-stare, Thor is grinning very much in the way a Golden Retriever-turned-human might. If he'd had a tail, it'd be wagging with glee.

Part of it is because he knows he's helping his brother, and though they'd said their piece to each other in the elevator on Sakaar, and though Thor had more or less come to grips with letting his brother go, the truth of the matter is is that he'll always care. Thor had meant it when he'd told Loki that he'd thought the world of him. It didn't matter where Loki had come from, or the sorts of troubles he'd gotten into. They were - are - brothers, and as such, Thor takes joy in the ability to help Loki, even in small ways.

And then part of it is, of course, because he's being a complete jerk about going about helping his brother, and there's a definite triumph in that. He easily could've handed over the hat, handed over the coat, handed over whatever else he could manage to spare, but .. this is so much better.

"C'mon, arms up," Thor asks again, holding the sweater up enticingly. "Do you want the sweater or not, brother?"