Every day, 3,000 pounds (some 1,350 kilos) of scraps arrive at the group’s massive warehouse in Brooklyn — part of a huge complex that used to belong to the US Army, according to Fabscrap founder Jessica Schreiber.The organization has established partnerships with about 250 ready-to-wear labels and several haute couture houses — and the waste they collect is representative of that variety.

You see everything in the warehouse piles: from luxury pieces by the likes of Oscar de la Renta or Marc Jacobs, to mainstream retail labels like J.Crew, to scraps from the workshops of up-and-coming designers.Last year, Fabscrap picked up a total of 150,000 pounds of fabric.But Schreiber says there is a wide potential to do more, as that number only accounts for a third of the textile waste ge…