The amount of yarn needed depends on the weight and gauge of the yarn used; obviously, chunky yarn will wind faster and you’ll need less. For a dryer ball made of worsted weight wool yarn, you’ll need about 3 ounces.
Old Pantyhose or a Sock
Cotton or Acrylic Yarn or String: You can use scraps here, too. This will be used to tie the hose or sock. You don’t want this to felt, so don’t use the wool yarn here.