UNDIES FABRIC is a type of fabric used to make underwear. It is commonly referred to as tricot, which is a French word meaning 'knitted fabric'. This type of fabric is lightweight and stretchy, making it ideal for use in underwear. It is also breathable and comfortable, making it a popular choice for lingerie and other intimate apparel. Tricot is usually made from cotton, polyester, or nylon, and is often blended with spandex for added stretch.