The origins of denim are fuzzy. It might have been the 16th or the 17th century in which the textile was invented, in France or England, with the name “jean” or “serge de nim”. By the eighteenth century, the now-completely-cotton fabrication had moved across the Atlantic, being advertised as “eternally young” and recognized (and sought after) for exceptional durability and comfort.
In the 19th century jean and denim were two completely different fabrics, though both were used mostly for work. That all changed when a Bavarian-born businessman, Mr. Loeb Strauss hit the San Francisco scene. The rest as they say, is history (although we may delve deeper in Mr. Strauss’ company very soon). I think it's safe to say we are obsessed.