Undershirts are a type of garment worn beneath the outer clothing to provide comfort and absorb perspiration. There are many synonyms for undershirts, including singlets, tank tops, undershirts, vests, and undershirts. Singlets are a type of shirt that covers the torso and has a sleeveless design, while tank tops are a type of sleeveless undershirt that features a scoop or round neckline. Vests are a type of sleeveless undershirt with a V-shaped neckline and provide additional warmth in colder temperatures. Undershirts, on the other hand, are typically made from lightweight cotton fabric and are worn to absorb sweat and prevent stains on the outer clothing.