The bottoming shirt can be worn directly on the body, and underwear (such as a bra) can be worn inside, and then it can be worn with any clothes. It's usually called a bottoming shirt. In other words, it is a close-fitting T-shirt or sweater, which can be matched with any coat. A bottoming shirt is a dress with a nice color under a sweater or a suit, and leggings are tights worn with a long coat like cropped trousers.