I use the chalkboard fabric from Joans. ITs a good thin vinyl but you will need to back it with some dacron (insignia tape works well as does the seam aid Joans sells) or it stretches and cuts easily on sharp rod ends since it just has a screen mesh cheese cloth backing. ITs what I used on this nose job. Bisonyl fabric is almost the same thin pvc vinyl but I think it has a stronger backing mesh.
IMG_0643 by
Ca Ike, on Flickr