plural of hair-shirt

A casual, usually short-sleeved, shirt with a protruding collar and a small number of buttons extending a short distance below the collar (and not all the way down the front of the shirt).

A polo shirt.

(idiomatic, informal) One who is pompous or self-important, especially one who is officious in a position of authority. / (usually hyphenated) Used attributively.

(bodybuilding) A sleeveless shirt tailored to display the muscles of the body.

A method of indicating team membership, typically when played by boys or men in informal sporting contests, in which the members of one team (the "skins") remove their shirts and play shirtless, while the others (the "shirts") leave their shirts on.

plural of T-shirt

A heavy shirt, often worn in place of a jacket in cooler weather. It may have buttons or a zippered front, and typically has two breast pockets.

A shirt of the kind worn by rugby players, usually short-sleeved and with a buttoned opening at the neck like a polo shirt, but with a stiffer collar.

(South Africa) A shirt with a batik pattern of the kind often worn by Nelson Mandela.