Kimbley tenses when Greed throws the coat over his shoulders and while he does look at the Homunculus suspiciously, he's not complaining. Once he's sure that Greed isn't going to yank the coat away from him, Kimbley sets about pulling it on properly and buttoning it up. He stops a couple of buttons down from the neck - no matter how cold he gets, he doesn't like having things pressed against his neck.

"Yeah, okay." It's not a thank you because Kimbley's never bothered thanking anyone. He folds his arms again and while the coat kind of hangs on him, at least it's warm. He's not sure what else to say so he decides to stay quiet, instead continuing to look for something (anything) among the snowdrifts.

...He is grateful, alright?