How do you choose your clothes for a long day of poker?

For me, it's all about comfort and warmth, because poker rooms are really cold sometimes. If you're going all in, or you have a monster hand, or you're trying to bluff like you're already kind of nervous, and you're trying to hide your shivering? Being cold on top of it is not good. I didn't used to double up my clothing layers, and now I do.