Jeans were the classic clothes of the American West.
In 1853, a young tailor from Germany, called Levi Strauss, began working in San Francisco; Levi sold thick canvas to miners; the miners used the canvas to make tents.
One day, a miner told Levi that he could not find trousers that were strong enough for work in the gold mines. Levi decided to make some trousers out of canvas.
Very soon, he had sold all the canvas trousers he had made! They were just what miners wanted.
However, the canvas was rather heavy and stiff. Levi therefore began to look for a different textile; soon he found a heavy textile from France; it was called serge de Nimes. Americans just called this de Nimes, and this name soon got reduced to denim.
Denim was a bit lighter than canvas, but it was very strong; it was ideal for miners.