How to Store Off-Season Clothes Without Feeding the Moths

Last October I pulled my winter knits out of a storage bin and found a hole in the shoulder of a lambswool sweater I had worn exactly twice. The bin was clean. The closet was clean. Nothing smelled musty, nothing looked wrong — the sweater just went into storage healthy in April and came out with a window in it. The larva that did it had months of undisturbed feeding, and it spent them on the best wool in the bin. Of course it did. That is the part nobody warns you about: moths have taste.

Clothes moths — mostly the webbing clothes moth, Tineola bisselliella — do not eat your clothes. Their larvae eat keratin, the protein in wool, cashmere, silk, feathers, and fur, and the adults seek out dark, quiet places to lay eggs where that food will be waiting. A storage bin in a closet is not a convenience to them. It is a pantry with the lid left on loose. The good news is that moth-proof storage is not a product you buy. It is a short list of habits, and every one of them is free.

Clean everything before it goes in

This is the step people skip, and it is the only step that matters most. Adult moths are drawn to the residues on worn clothing — sweat, body oils, food traces, the invisible grime of a season — more than to the fiber itself. A freshly laundered sweater is a less attractive egg-laying site than one worn three times, and a stain gives larvae a starting point even on fabric they would otherwise ignore. Eggs laid on a soiled garment hatch into larvae that feed on both the stain and the wool underneath.

So the rule is simple: nothing goes into storage dirty, not even “just worn once.” Wash according to the label — the care label decoder covers what those symbols actually mean — and for wool and cashmere, follow the fiber-specific routine we laid out in the cashmere care guide. Dry cleaning also works, and for anything already showing moth damage it is the surer option, because professional cleaning temperatures kill eggs and larvae that home washing might miss.

One caveat: make sure everything is fully dry before it goes into a bin. Trapped moisture does not attract moths, but it invites mold and mildew, which will ruin a garment faster than any insect.

Match the container to the fiber

The storage container question is really a breathability question, and the answer splits by fiber.

Wool, cashmere, silk, and anything knit want to breathe. Fold them with acid-free tissue in the creases if you are feeling careful, and put them in cotton zippered garment bags or lidded boxes with ventilation — canvas, cotton, or the lidded plastic bins with the small air slots. What you are keeping out is light, dust, and moths, not air itself. Fully sealed containers work too, and are actually the gold standard against moths, as long as the contents are completely dry and you can tolerate the creasing.

Down jackets and leather are the two exceptions worth knowing. Down needs loft, so it hangs or rests uncompressed — a vacuum bag will flatten it for a full season and it will never quite recover. Leather and fur need air circulation; sealed plastic traps humidity against the hide and invites mildew. Hang them in breathable garment bags, away from the wool bin.

And vacuum bags: useful for synthetic activewear and sturdy cotton, pointless for everything else. Compressing wool for months sets permanent creases and does nothing a clean bin cannot.

Skip the cedar, seal the bin

Here is the part that will annoy the cedar industry. Cedar blocks, rings, and closet liners smell wonderful and do almost nothing at the concentrations a closet provides. Cedar oil does repel and kill young larvae — in laboratory concentrations. The oil evaporating off a $4 block fades to background within a few weeks, and the entomology extensions that have actually tested this, including the ones at major land-grant universities, keep reaching the same conclusion: cedar is a fragrance, not a defense. Lavender sachets rank below cedar. Mothballs work but are naphthalene or paradichlorobenzene — pesticides, effectively — and not something most people want permeating their knitwear.

What actually works is exclusion. Eggs and larvae cannot eat wool they cannot reach. An airtight container, a sealed cotton bag, a closet cleaned of old wool scraps — that is the whole defense, and it works because it denies access rather than repelling. Add monitoring: pheromone traps catch male webbing clothes moths and tell you whether you have a problem at all. They do not solve an infestation, but a trap that stays empty all season is the cheapest peace of mind in home care.

If you suspect an item already carries eggs — a thrifted coat, a vintage find, anything from an unknown closet — seal it in a plastic bag and freeze it for a week at 0°F. Thaw it fully before opening the bag, since condensation on cold wool is its own small disaster.

Store in the right room, if you can

Attics and basements are the default storage zones in most homes, and both are mediocre choices. Attics swing hot — sustained attic heat ages elastic, adhesives in shoes, and synthetic fibers. Basements swing humid, and humidity brings the mold problem back. The best storage climate is the one you already live in: cool, dry, dark, and stable. An interior closet, a bedroom wardrobe top shelf, under-bed boxes in a climate-controlled room. Dark matters as much as temperature; sunlight fades dyes through fabric faster than most people expect, even in a “briefly opened” storage area.

The swap-day routine

Twice a year, when the wardrobe rotates, the whole routine compresses into about an hour: launder what is going into storage, bin it by fiber with down and leather handled separately, seal, and put the bins somewhere cool and dark. Then vacuum the closet they came out of — carpet and closet crevices hold the larvae and hair the next generation feeds on.

On day one, a sealed bin of clean wool looks identical to a loose pile of worn sweaters. By month three, one is a season of clothes and the other is a breeding site. The label tells you what a garment is made of. The bin decides what survives until next season.

Cheap where it shows, not where it doesn’t — and in storage, what shows in April is whatever you skipped in October.