I would think fabric companies are like most every other company and they are asked by many, many groups seeking donations. My dad always said, " Nothing beats a try but a failure." So asking can't hurt. You have nothing to loose and may gain some fabric. I might also suggest having your local paper to do a small article on your goals and ask for local support either from money donations or fabrics. Don't forget to specify the type of fabric you need or you will get everything from sheer curtains to upholstery fabric! I applaud your efforts.