True blue: Denim has to change to save the planet

Denim derives many of its most prized qualities — the way it feels and fades, its durability — from how it's made. It's woven with an undyed horizontal yarn (the weft) made usually of cotton or cotton blend passing over and under at least two vertical indigo-dyed yarns (the warp), creating its classic diagonal twill and other characteristics, including strength. Sounds simple, but it involves an intricate set of processes, many of them environmentally troublesome....
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