It was on California Street that Levi and his brother-in-law David Stern opened a dry goods wholesale business called Levi Strauss & Co. Levi was often found leading a pack-horse, heavily laden with merchandise, directly into the mining camps found throughout the region. The story goes that both prospectors and miners, often complaining about the easily torn cotton "britches" and pockets that "split right out" gave Levi the idea to make a rugged overall trouser for the miners to wear. These were fashioned from bolts of brown canvas sailcloth, with gold ore storage pockets that were nearly impossible to split. Levi exhausted his original supply of canvas as the demand grew for his hard-wearing overalls, and so he switched to a sturdy fabric called serge, made in Nimes, France. Originally called serge de Nimes, the name was soon shortened to denim.