The term BASIC SHIRT can be summarized as a TEE, which is a three-letter acronym for a type of clothing. A TEE is a short-sleeved casual top, generally made of a light, inexpensive fabric. It is usually a plain-colored garment with a round neckline and no collar. It is often worn as an undershirt or as a casual outer garment. TEE shirts are popular among all age groups and have become a staple in many wardrobes.