Yarn: The ideal yarn is the same fiber content, weight, and color as the garment. This will create the most invisible repair.

In this tutorial, heavier contrast color yarn is used to show the technique. See details on the invisible version in Steps 17 - 19.

Thread the needle with a length of yarn no longer than 24 inches (~61 cm). Don't knot the thread.

For more info, see Needles and Thread.