Writing in The New York Times Book Review about some pro- and anti-Bush books, Timothy Noah notes that he learned this from David Aikman's A Man of Faith: The Spiritual Journey of George W. Bush:

If Bush is relaxing after hours in a sweater and needs to fetch something from the Oval Office, he will change into business attire, then change back out of it when he's done.

Noah adds, invoking the color-coded 2000 election map,

Red teamers will think this is admirable; Blue teamers will think it's insane.

Yep -- he's right about that.

(And you know what else? Any Red-staters who think that's admirable are also insane.)