I second this one. Cedar works very, very well in moth prevention. Many people have their closets made of cedar for that reason. But you can buy small cedar eggs (they’re shaped like eggs..they’re not really eggs. Had to say that before Denny or Slood say something snarky ) and just tuck them into your drawer and that should do the trick. They look like this:
Having grown up in a family of spinners and weavers I do know a thing or two about wool. There are two terrestrial arthropods one has to be concerned about regarding wool and other natural animal fibers. The first of course is the wool moth the second and my personal favorite is the dermestid beetle, a species I have currently living in my mudroom inside several large jars where they are contracting with me for the bird bone cleaning work.
Fiber hygiene is the most important aspect to keeping these fellows away from clothing. All natural fibers need to be kept very clean, the dermestids get attracted to food particles/stains on clothing. Additionally the dust bunnies hopping around homes are to be eradicated with extreme prejudice. Animal hair is floating in the air of every home. When it settles into the nooks and crannies of your house, and coalesces into dust bunnies, it provides the prefect habitat for moths and dermestids. They particularly enjoy the places where walls meet, corners, ceilings, baseboards, etc.
My wife who was a complete innocent, non-weaver, before she met my mother and sisters has more wool in our home than a sheep ranch yet we have never had a wool moth, unlike my mother’s home or my sister’s homes. We have had the occasional dermestid, who likely was an individual failing to honor his/her contract with me, but I have usually found them on a curtain or something before they could cause any damage.
I do use cedar, Juniperus virginiana. Cedar can be “renewed” with a light sanding, even really old cedar or you can purchase cedar oil. There is some evidence that humans and animals can develop respiratory sensitivity to some cedars, especially cedar beds for pets, so it is best to keep it confined to airtight spaces unless it is sealed in which case it doesn’t have any repellant qualities.
We even sleep on a wool bed, like a feather bed only better, that is several generations old that has never had any signs of moths or dermestids. I own a wood trunk that was built by my great-great grandfather in Co. Limmerick that contains a coverlet woven by my great-great grandmother when she was 65 and a coverlet woven by my great grand mother when she was in her fifties. As far as I can tell the trunk is pine, likely Pinus sylvestris but it is very tightly made so not even a little dermestid could squeeze inside.