When I first started shooting I would just go through my closet and find old cloths(in good shape) and use them. A dress shirt that is all cotton works well. It has a good tight weave. I've used flannel, while not the best the material compresses allot and works with light loads. I had some old BDUs that actually was all cotton, worked very well. It is a little thicker though, similar to denim. Pillow ticking is sort of traditional but really it is just cotton clot with a tight weave(usually) and has the stripes printed on to give it the look.