Levi's 50 1 is the world's first numbered jeans, which made its debut during the gold rush in San Francisco. Cowboys were originally miners' tools. With the industrialization of the United States, 50 1 was born and began to be adopted by factory workers. It even appeared in Chaplin's film Modern Times. The biggest feature of Levi's 50 1 is that the front of trousers is designed with metal buttons instead of zippers, which is Levi's most classic jeans style. Slim jeans are more suitable for men with slender legs, so they are also the most critical of men's figure and temperament. It is easy to show a delicate and elegant male image, and a slim suit is the best choice. For example, Levi's s606, EDWIN502 and Lee30 1 all belong to thin jeans. Small and large horn trouser leg type: a popular style in the 1970s, with huge trouser legs below the knee, such as Levi's646 and other brands. Bell bottoms are popular styles in 1970s and 1980s, which can create perfect leg curves. However, in recent years, bell bottoms have been rare. Boot jeans are characterized by their legs gradually widening below the knee, but their heels are longer than the front heels. It is similar to bell bottoms, but the whole trousers are natural and smooth, which can modify the leg shape to a certain extent, and it is also a popular jeans style in recent years.