What is T-Shrt

A T-shirt (T shirt or tee) is a style of shirt. A T-shirt is buttonless and collarless, usually with short sleeves and frequently a round neck line.
T-shirts are typically made of cotton fibers (sometimes others), knitted together in a jersey stitch that gives a T-shirt its distinctive soft texture. T-shirts can be decorated with text and/or pictures, and they are often used to advertise (see human billboard), promoting products, companies, films and websites.
T-shirt fashions include many styles for both men and women, and for all age groups, including baby, youth, teen, adult and elderly sizes.
The T-shirt evolved from undergarments used in the 19th century, through cutting the one-piece "union suit" underwear into separate top and bottom garments, with the top long enough to tuck under the waistband of the bottoms. T-shirts, with and without buttons, were adopted by miners and stevedores during the late 19th century as a convenient covering for hot environments.
T-shirts, as a slip-on garment without buttons, originally became popular in the United States when they were issued by the U.S. Navy during or following the Spanish American War. These were a crew-necked, short-sleeved, white cotton undershirt to be worn under a uniform. It became common for sailors and Marines in work parties, the early submarines, and tropical climates to remove their uniform "jacket", wearing (and soiling) only the undershirt.^[1]
Named the T-shirt due to the shape of the garment's outline, it soon became popular as a bottom layer of clothing for workers in various industries, including agriculture. The T-shirt was easily fitted, easily cleaned, and inexpensive, and for this reason it became the shirt of choice for young boys. Boys' shirts were made in various colors and patterns. By the Great Depression, the T-shirt was often the default garment to be worn when doing farm or ranch chores, as well as other times when modesty called for a torso covering but conditions called for lightweight fabrics