Furlow47:
I noticed that, too!! I tried (un-creepily, I swear!) to smell him. Nothing.
That was one of the first things that people asked me, aside from how he looked close-up, was how did he smell? I was struck by how he didn't smell like ANYTHING and that when I hugged him he was not at all sweaty and his shirt just felt crisp and clean. My husband suggested that since it was during the encore, he probably changed his shirt after he left the stage for the first time.