The small white or cream-colored “worms” you’re finding in your clothes are almost certainly clothes moth larvae. Adult clothes moths don’t eat fabric at all. It’s the larvae, the worm-like stage, that do all the damage, feeding on wool, silk, fur, feathers, and other animal-based fibers. These tiny caterpillars can digest keratin, the protein found in animal fibers, which is why they target your favorite wool sweater but leave polyester untouched.
What Clothes Moth Larvae Look Like
Clothes moth larvae are small, pale, worm-shaped caterpillars. They’re typically white or cream-colored with a darker head capsule, and they grow to roughly a quarter inch long before pupating. Two species cause nearly all clothing damage, and you can tell them apart by what they leave behind.
Webbing clothes moth larvae spin temporary silken tubes or tunnels as they feed. They crawl out and move on when they’ve eaten their fill, leaving the tubes behind along with silk mats that accumulate tiny particles of fabric and excrement. Casemaking clothes moth larvae take a different approach: they build a permanent cigar-shaped silken case, about 3/8 inch long, and carry it with them wherever they go. The case often has bits of the fabric they’re eating woven right into it. Both species produce excrement that matches the color of the fabric they’ve consumed, so droppings on a blue wool blanket may appear blue.
What They Eat and Why
Clothes moth larvae feed exclusively on animal fibers: wool, cashmere, silk, fur, felt, feathers, and leather. In nature, they survive on bird nests and animal carcasses, which are rich in the same keratin protein. Cotton and synthetics like polyester are rarely attacked on their own, but blended fabrics (a wool-polyester blend, for instance) can still be targeted. Fabrics heavily soiled with food stains or body oils are also at risk, because the oils and residues provide extra nutrition that can attract larvae even to materials they wouldn’t otherwise eat.
Adult clothes moths have no functioning mouthparts. They don’t eat anything. Their only job is to mate and lay eggs, which means every hole in your clothing was chewed by a larva, not the small golden or brownish moth you might spot fluttering near your closet.
How Long the Larval Stage Lasts
The larval stage is by far the longest part of the clothes moth life cycle, and it varies enormously depending on temperature and food availability. Under favorable conditions (warm temperatures, plenty of wool or fur), the larval stage lasts about 67 days. In cooler or less ideal environments, it can stretch to nearly two and a half years. That extended timeline is one reason infestations can persist for so long without obvious signs: the larvae are small, they feed in hidden areas, and they can survive for months between meals.
Eggs hatch in 4 to 10 days after being laid. After the larval feeding stage, pupation takes another 8 to 44 days before a new adult moth emerges. Larvae become inactive below 40°F, which is why cold storage and freezing are effective control methods.
Signs of an Infestation
Clothes moth larvae prefer dark, undisturbed areas. They feed in spots you’re unlikely to check regularly: under collars, along seams, inside folded sweaters at the back of a drawer, or deep in a closet where garments hang untouched for months. The damage itself shows up as surface grazing (a thinning of fibers that looks almost threadbare), irregular holes, or both. On fur items, you may notice hairs clipped at their base, leaving loose fur and patches of exposed hide.
Beyond the damage to fabric, look for silken tubes, mats, or patches in the hidden portions of clothes. These silken structures often have fibers and tiny fecal pellets woven into them, making them blend in with the surrounding material. If you find a small cigar-shaped case attached to fabric at one end, that’s a casemaking moth larva, likely still alive inside and actively feeding.
How To Get Rid of Clothes Moth Larvae
Start with the items that are already infested. Washing in hot water kills larvae and eggs on fabrics that can tolerate it. For delicate woolens, silks, or items that can’t be washed in hot water, freezing works well. Place the garment in a sealed plastic bag and leave it in a household freezer (0°F or below) for at least 72 hours. Some experts recommend repeating the freeze cycle after a brief return to room temperature to catch any survivors.
Dry cleaning also kills all life stages. If you’ve found larvae on a treasured garment, professional cleaning both eliminates the infestation and removes the body oils and stains that attracted the moths in the first place.
Thoroughly vacuum the closet, dresser drawers, and any area where you found signs of larvae. Pay attention to cracks, corners, and baseboards where lint and hair accumulate, because these organic debris provide food sources. Empty the vacuum bag or canister into an outdoor trash bin immediately after.
Pheromone traps are useful as a monitoring tool. They use a scent that attracts adult male moths to a sticky surface, which helps you gauge whether an infestation is ongoing. They won’t eliminate an active infestation on their own, but a trap that keeps catching moths tells you larvae are still present somewhere.
Preventing Reinfestation
The single most effective prevention step is cleaning garments before storing them. Clothes moth larvae are drawn to fibers that carry sweat, skin oils, and food residue. A wool coat worn all winter and hung in the closet unwashed is an ideal target. The same coat, cleaned before storage, is far less attractive.
Store vulnerable items in airtight containers or sealed garment bags. Zipper-sealed plastic bins or vacuum-sealed bags physically block adult moths from reaching the fabric to lay eggs. This matters most for seasonal items you won’t touch for months, like winter sweaters stored through summer.
Cedar and lavender are traditional repellents, and cedar oil does have some effect on very young larvae. But neither is strong enough to kill established larvae or prevent a determined infestation. Cedar’s effectiveness also fades as the wood dries out, which is why cedar oil restoration sprays exist. These natural options work best as a supplement to proper cleaning and sealed storage, not as a replacement.
Regular use of stored clothing is itself a form of prevention. Larvae thrive in undisturbed environments. Simply taking garments out, shaking them, wearing them, and exposing them to light and air disrupts the still, dark conditions the larvae need. If you have wool or silk items you rarely wear, those are the ones to prioritize for sealed, clean storage.