Sedaris Interview
Here it is. My favorite part is:

I'm doing Letterman in July. He's always very nice to me. But it will be torture. The last time I was on, my dad called me right after and said, "You looked terrible!" And on my way to the taping, some guy on the street said, "You look like s-t!" I mean, you have to look like you belong on TV - and just the effort is embarrassing. The idea that people think, "Oh my God, he consciously wore that thinking he would look good! He chose that tie! He thinks he looks good like that!"