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
Camisole
…A camisole is a sleeveless undershirt typically worn by women, extending to the waist. The camisole is usually made of satin, nylon, silk, or cotton. Historically, camisole referred to…
Example of a T-shirt to be worn as an undershirt and usually not as outerwear