A shirt is a shirt style fabric, named for the T-shaped body and sleeves. Usually it associated with short sleeves, round neck line known as a collar and no collar.
Typically made of cotton fibers in a knitted stockinette, they have a distinctive smooth texture compared to woven shirts. Most modern versions have a body made of a fabric tube continuously, in a circular, so that the torso loom does not have side seams. The manufacture of shirts has become highly automated, and may include cutting the fabric by laser or water jet.
The shirt evolved from undergarments used in the 19th century, through cutting a piece union suit underwear into separate top and bottom garments, with the top long enough to tuck under the waistband of the pants. With and without buttons, which were adopted by miners and stevedores during the late 19th century as a convenient covering for hot environments.
As slip-on garment without buttons, originally it became popular in the United States when they were issued by the US Navy during or following the Spanish-American War of 1898. It was a crew neck, short sleeves, white cotton shirt 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 only a shirt.