Although clothes moths will eat silk, fur, and felt clothing and bedding items, they are best known for making large, annoying holes in wool clothes and blankets. Since clothes moths prefer to munch on wool that is not in constant use, your stored sweaters and bed throws are particularly at risk. You can repair the moth damage in your favourite sweater by darning the holes. If you can do any fibre craft (knit, sew, embroider, quilt), you can darn. Darning is reweaving the fibres on a wool item.
Pick the right yarn. If you did not save the little bit of extra yarn that came with your sweater, take the sweater to your local yarn or craft store and purchase yarn of similar thickness and texture to your garment. You can choose a matching or contrasting colour, depending on the look you want on your finished piece.
Begin darning. Thread the darning needle with two feet of yarn. Weave the yarn in and out of the garment with a running stitch 1/2 inch away from one side of the hole and extend your stitches 1/2 inch above and below the hole. This will anchor the thread in the sweater without having to tie a knot.
Weave the hole. When you get to the actual hole, run the yarn across the hole, but keep making the 1/2 inch above and below running stitches. Keep these runs of yarn and stitches as close to each other as possible. When you get to the other side of the hole, do running stitch rows out 1/2 inch to match the beginning. Turn your work 90 degrees and continue, only weave the mending yarn over and under the straight yarn you ran across the hole at first. Weave as close together and tightly as possible.
Finish darning. Once the hole has been woven shut, continue with running stitch rows to 1/2 inch away from the weaving to secure the end of the mending yarn. Snip off excess yarn.