A T-shirt, or tee for short, is a style of fabric shirt named after the T shape of its body and sleeves. Traditionally, it has short sleeves and a round neckline, known as a crew neck, which lacks a collar. T-shirts are generally made of a stretchy, light, and inexpensive fabric and are easy to clean.

A shirt, also an overshirt or a classic shirt, is a type of clothing related to the outer underwear. Historically, the shirt refers specifically to underwear, but since the 1960s it can be worn on its own, without being covered with other clothes.