Lavender..
dried in bunches and put in the wardrobe, chest, whatever.
try this.. made with moth repellent herbs
2 ounces each of dried rosemary and mint
1 ounce each of dried thyme and ginseng or lavender
8 ounces of whole cloves
mix them together and then use them to fill little cotton sachets to put in your wardrobes and drawers...