The exact date of the birth of jeans is May 20, 1873. On this day, the Patent and Trademark Office issued a patent for overalls to two immigrants, Levi Strauss and Jacob Davis. This kind of labor trousers is made of a kind of "denim", which has been reinforced during sewing, and has trouser pockets and trousers doors. Strauss was the owner of a small department store at the time. With this new trouser style, Strauss hoped to satisfy the demands of gold miners who often complained that the pockets of their trousers could not hold the gold particles they carried inside.