Lizzie Knight

Associated Press

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This April 10, 2012 file photo shows the production department at fashion giant Inditex's headquarters where Zara fashion garments are designed in La Coruna, Spain. Inditex, the retail giant that owns Zara, H&M and many other brands, announced a sustainability pledge in July, for example, saying it wants all its clothes to be made from sustainable or recycled fabrics by 2025.

Sustainability in Fashion Faces Barriers

It would take 13 years to drink the water that is used to make one pair of jeans and one T-shirt, says one expert.