The white one has the article number, composition, laundry instructions and maintenance instructions, as well as the national implementation standard number of clothing. That's called the laundry label, and professionally it's called the washing label. If it is casual or jeans, the leather outside the waistband is called a leather label, which is usually the name of the brand to show its brand. If there is a small tag inside the belt, it is called a lug, which is mainly for decoration. Another function is to wear the clothes hanger inside after washing the trousers and hanging them to prevent the wind from blowing off. That's it. If there is a label on the inside of trousers, that is, the cloth in the front pocket, it is called quality label, which is the history and introduction of the brand. This kind is rare, and it is on Jiu's pants. If you want to know more about clothing, please add my screen name 4 14895426.