[Gilbert is from the same day, before all of the chaos began, so of course he recognizes that he's from that same day. And the clothes don't look too ruffled so he guesses that it's before anything completely crazy happened. He's thankful for that.
He's looking the other up and down, and then he finally returns that smile, just slightly, in relief. He then frowns again, and averts his gaze a little bit. He has to keep his cool. If Oz can keep his cool, so can Gilbert. If Oz isn't crying, then neither is Gilbert. He has to be cool... Cool...]
I'm sorry.
[He reaches out and removes a stray hair from his face, completely on impulse, and he sighs.]