From the Millennium-Arc
If you can see moths, these aren't the ones to worry about. Moths that cause damage to clothes are too small to notice. It is the larvae of these moths that eat fabric.
Prevention. Store items in a clean condition; moth larvae especially like areas soiled with food stains.
Rosemary, Mint, Thyme, Cloves, and Ginseng (optional). Chicago area weavers and spinners use 1/2 pound rosemary, 1/2 pound mint, 1/4 pound thyme, 1/4 pound ginseng (optional), and 2 tablespoons cloves. Mix and put in cheesecloth bags and place in closets or drawers.
Dried Lavender or Rosemary and Mint. Make sachets of dried lavender or equal portions of rosemary and mint. Place in closets, drawers, or closed containers to mothproof garments.
Rosemary, Sage, Mint, Dried Lemon Peel, and Cinnamon. Mix handfuls of first three ingredients. Add a little lemon peel and a pinch of cinnamon. Place in muslin bags.
Molasses, Vinegar, and Yellow Container. To trap moths, mix 1 pan molasses with 2 pans vinegar and place in a yellow container to attract moths. Clean regularly.
Clothes Dryer. Kill moth eggs by running garment through a warm dryer.