ETYM Old Eng. schirte, sherte, schurte.
A garment worn on the upper part of the body.
Garment worn, especially by men, on the upper part of the body, usually buttoned up the front and with sleeves and a collar. Formal or summer shirts are often made of cotton or another light fabric; casual shirts such as polo shirts tend to be made of a jersey stretch fabric.
(Familier) Chemise.