"What's wrong with this coat?" the Doctor asked, twisting around to look at the trailing length of fabric. "It's just like the other one. Well, not really. I didn't get it from Janis Joplin. It's not brown, either. Doesn't fit quite as well. Still, it doesn't clash, does it?"
Maybe the coat wasn't all that important, but the Doctor was genuinely worried that he'd made a bad choice. This incarnation was a bit concerned with looks, after all, and he especially wanted to dress well around Rose.