The back pocket of Levi jeans has a double arch design called the Arcuate for which the company holds a trademark. Arcuate means 'curved like a bow'.
During World War II, the US government ruled that the design served
no practical purpose, was only decorative, and due to wartime
rations involving cotton, did not allow the company to use extra
thread to create the arcuate. To maintain the trademark during those
years, the company painted the design on the jeans.