Fun facts from wiki:
The name "denim" derives from French serge de Nîmes, meaning "serge from Nîmes".[3][4]
Denim was traditionally colored blue with indigo dye to make blue jeans, although "jean" formerly denoted a different, lighter, cotton fabric.
The contemporary use of the word "jeans" comes from the French word for Genoa, Italy (Gênes),[1] where the first denim trousers were made.
Denim has been used in the USA since the mid 19th century. It was introduced to California by Levi Strauss, who—in 1853, during the California Gold Rush—imported denim fabric from France and used it to create sturdy, hard-wearing trousers that would later become the ubiquitous blue jeans.
Also, Strauss first used the material to make tents, before switching to trousers.
.