... used for tailoring, trousers, jacket, medium, heavy fabricb) (20s/2), (20s/3): used for jeans, upholstery PVC bags, canvas, ... footwearc) (40s/2) for shirts, jackets, pants, 20/2, 20/31) 20/2, 2000yards/3000yards/2000 meters/3000meters2) 20 ... /3, 1600yards/2000yards3) 40/2, 3000y/4000y/5000yards/5000 meters4) 40/3, 2600yards/3000yardsAbout ...