Automotive upholstery is NOT the same as non-automotive fabrics. For starters, automotive upholstery is uniquely woven and finished with specialized chemicals for UV protection, to meet flammability requirements, wear, fiber elongation, color fastness, etc., etc., etc.
Just a factoid from someone who's spent 23 years in the textile industry.
While anyone can use anything they wish, just sharing "for what it's worth!"