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.

A polo shirt.

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.

plural of aloha shirt

A collared, short-sleeved shirt of a style originating in Hawaii, typically having a brightly-colored Polynesian print.

plural of Hawaiian shirt

An undershirt.

A collared shirt of a type originating in Hawaii, often brilliantly colored with floral or Polynesian patterns.

plural of golf shirt