Eve,
Stockinette is that tubular roll of soft pollishing cloth that comes on a roll , you can get it from Halfords for polishing your car, or any good hardware shop will stock it for cleaning cloth, I use it for straining the whey from the curds for our goat cheese, and also for soaking oats for one of our horses , very versatile stuff, Just cut it off to the length you need. For hams tie off one end to make a bag, insert ham , twist the bag and double it over, then do it again till you have three or four layers of cloth over the ham.