An undershirt is a type of garment worn underneath the main shirt or blouse. It is typically made of lightweight fabric and is designed to be worn next to the skin, providing an additional layer of comfort and protection. The undershirt, often referred to as a "tee" or "t-shirt," is commonly used to absorb sweat, prevent body odor, and provide a barrier between the body and outer clothing. It is available in various styles, such as crew neck or V-neck, and can be short-sleeved or long-sleeved depending on personal preference and weather conditions.