Was he actually checking to make sure he was looking smart? Martha stifled her laughter, though it did emerge in her ongoing brilliant smile. "Clearly not the same as I'd remember, look at you," she pointed out, laughing. "It works, somehow, this. The bowtie, certainly." Maybe she was wanting to see what he'd do with a compliment, though she knew better than to ever expect consistent results from the Doctor.

wouldn't looking different mean something terrible had happened to him--

She quashed the thought. "Hug, for old times, then? I should have known you'd turn up here somehow, it seems like your sort of party."