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A shirt is a cloth garment for the upper body. Originally an undergarment worn exclusively by men, it has become, in American English, a catch-all term for almost any upper-body garment other than outerwear such as sweaters, coats, jackets, or undergarments such as bras, vests or base layers.

In British English, a shirt is more specifically a garment with a collar, sleeves with cuffs and a full vertical opening with buttons or snaps. (North Americans would call that a "dress shirt", a specific type of "collared shirt"). A shirt can also be worn with a necktie under the shirt collar. There are two main categories of fibres used: natural fibre and man-made fibre (synthetics or petroleum based). Some natural fibres are linen, the first used historically, cotton, the most used, ramie, wool, silk and more recently bamboo or soya. Some synthetic fibres are polyester, tencel, viscose, etc. Polyester mixed with cotton (poly-cotton) is often used. Fabrics for shirts are called shirtings. The four main weaves for shirtings are plain weave, oxford, twill and satin. Broadcloth, poplin and end-on-end are variations of the plain weave. After weaving, finishing can be applied to the fabric (source: wikipedia.org)