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thumb|240px|Example of a T-shirt to be worn as an undershirt and usually not as outerwear An undershirt in American English, vest in British and South African English, baniyan in the Indian subcontinent, or singlet in Australia and New Zealand, is an article of underwear worn underneath a shirt for warmth or to protect it from body sweat and odors. It can have short sleeves (T-shirt) or be sleeveless (A-shirt).