Buy some wooden beads. The number of beads depend on how long you want your necklace. I used 11.
Decide which fabric you wanna use. Fabric must be elastic, or else you can't pull it over your head.
Cut your fabric. Width depending on bead-size.
Sew the fabric, making a tube. Turn the tube right side out.
Put your beads into the tube, like this: Put in the first bead, push it in, so it's in the middle of the tube. Tie two knots, one on each side. Go from there, until all your beads are inside the tube. Tie the ends of the tube together and trim the ends.