Undershirt

An undershirt is a lightweight garment worn beneath another shirt, usually next to the skin, to add warmth, improve comfort, or absorb sweat.

T-shirt: A knitted shirt with a rounded neckline and short sleeves, worn as underwear or outerwear. The T-shirt is a common undershirt cut, though it is also worn on its own.
Layering (clothing): The practice of wearing multiple garments together for comfort, protection, or style. An undershirt is the innermost layer in many everyday outfits.
Going commando: Wearing no underwear beneath outer clothing. It removes the extra layer that an undershirt adds to the torso.
History of underwear: The historical development of garments worn beneath outer clothing. Undershirts belong to a long history of hidden clothing and changing dress conventions.
Sleeveless shirt: A shirt made without sleeves, leaving the shoulders and arms uncovered. Sleeveless undershirts reduce bulk beneath fitted sleeves.
Thermal underwear: Close-fitting garments designed to retain body heat beneath other clothing. Thermal undershirts are a warmer, purpose-built form of the garment.
Compression garment: A close-fitting garment that applies pressure to the body for support or performance. Compression garments prioritize muscular support, unlike ordinary undershirts.
Men's fashion: Clothing styles and dress practices associated with men. The undershirt became a familiar element of men's everyday dress.
Cotton: A soft natural fiber obtained from the seed hairs of cotton plants. Cotton is widely used for undershirts because it is soft and absorbent.
Athletic clothing: Garments designed for physical activity, with materials and construction suited to movement and exertion. Sports undershirts manage sweat and reduce friction during exercise.

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