A T-shirt (or tee shirt) is a shirt which is pulled on over the head to cover most of a person's torso. A T-shirt is usually buttonless, collarless, and pocketless, with a round neck and short sleeves. The sleeves of the T-shirt extend at least slightly over the shoulder but not completely over the elbow (in short-sleeve version). (taken from: http://en.wikipedia.org/wiki/T-shirt)