If your zipper slider has come off completely, you can reattach it by following these steps:
1.Thread the needle with a strong thread. You can use clear nylon thread or polyester thread.
2.Align the two pieces of the slider so that the teeth are meshed together. If the teeth are not lined up, your zipper will not work correctly.
3.Start at one end of the slider and sew through both pieces to secure them together. Try to keep your stitches as small and close together as possible so that they don't come undone easily.
4.Once you reach the other end of the slider, knot your thread securely and cut off any excess thread.