This is probably just a rumor but I read somewhere a while back that he has carpal tunnel in his wrists (I guess from signing all those autographs) and he is sort of self conscious about his arms. probably not true-but he does seem to have some hang ups about his body. I think its a nice one--I wonder if I told him that if he would hold it against me.
It's because his shirt and/or his jacket are perpetually on crooked -- medical science thought an unmade bed was an inanimate object until this honey hit the spotlight!
It's NOT longer, he pulls it down. He has a habit of tugging at it, it's a security blanket type of thing. One of his cutest mannerisms! If you look at his wife and kids they do it sometimes too!