http://www.levistrauss.com/wp-content/uploads/2014/01/A-Product-Lifecyle-Approach-to-Sustainability.pdf
As in climate change, we see that it's the user that consumes the most energy during the lifespan of a pair of Levi's 501 jeans. The production of the fabric does use a significant amount of energy, but overall, washing and drying uses the greatest amount of energy is during the blue jeans' lifespan.