If you’re finding small, irregular holes in your sweaters, scarves, or other woolens, clothes moths are the most likely culprit. But here’s the key detail most people get wrong: the fluttering moths you see aren’t the ones eating your clothes. Adult clothes moths don’t feed at all. It’s their tiny, worm-like larvae that chew through fabric, and they do it hidden in dark, undisturbed corners of your closet where you’re unlikely to notice until the damage is done.
Why Moth Larvae Target Certain Fabrics
Clothes moth larvae feed exclusively on animal-based fibers: wool, silk, fur, feathers, felt, and leather. These materials contain keratin, the same protein found in hair and nails, and moth larvae are one of the few creatures that can digest it. Synthetic fabrics like polyester and nylon are safe on their own, but blended fabrics (say, a wool-poly blend) can still be attacked. Larvae will also go after items soiled with food stains or body oils, even if the base fabric isn’t animal-derived, because those residues provide additional nutrition.
Two species are responsible for nearly all clothing damage in North America. The webbing clothes moth spins silken tubes directly on the fabric it’s eating. The casemaking clothes moth builds a small portable case out of fiber fragments and drags it around as it feeds. Both species’ adults are tiny, about the size of a grain of rice, and prefer to scuttle along surfaces rather than fly toward lights. If you’re seeing large moths circling your lamps at night, those are a different species entirely and aren’t interested in your wardrobe.
What Moth Damage Actually Looks Like
Moth holes tend to be small, irregularly shaped, and scattered rather than concentrated in one spot. You’ll often find them in areas that stay undisturbed for long periods: folded sweaters in a drawer, a wool coat at the back of the closet, a rolled-up rug in storage. The larvae prefer dark, warm, humid spaces, so damage frequently appears in folds and creases where fabric layers overlap.
Beyond the holes themselves, look for these signs:
- Silky webbing or tubes on the fabric surface, especially in creases or along seams. This is the hallmark of the webbing clothes moth.
- Small cylindrical cases (roughly the size of a grain of rice) attached to or near the fabric, made of the same fiber the larvae have been eating. These belong to the casemaking clothes moth.
- Tiny cream-colored caterpillars, less than half an inch long, on or near damaged items.
- Sandy-colored frass (larval droppings) scattered near feeding sites.
Moths vs. Carpet Beetles
Carpet beetles cause similar damage and are just as common, so it’s worth knowing the difference. Carpet beetle larvae are small, covered in tiny hairs or bristles, and they wander. You might find them in a completely different room from where they’ve been feeding. They don’t spin webs or build cases, and they leave behind small fecal pellets and shed skins near feeding sites.
Clothes moth larvae, by contrast, stay put on their food source. If you find damage but no webbing, no cases, and no larvae nearby, carpet beetles are a strong possibility. The prevention and treatment steps overlap significantly, but correct identification helps you know where to focus your efforts.
How To Kill Larvae Already in Your Clothes
Once you’ve spotted damage, your first priority is destroying larvae and eggs in affected items. You have three reliable options.
Freezing works well for delicate items you can’t wash aggressively. Seal the garment in a plastic bag, press out the air, and place it in a freezer set below 18°F for several days. Most home freezers run at 0°F, so this is straightforward. The plastic bag prevents moisture damage during thawing.
Heat washing kills all life stages. Water above 120°F is effective, but check garment labels first. Many wool items will shrink and felt if agitated in hot water. If your dryer has a non-agitating shelf or rack setting, that’s a safer way to apply sustained heat to woolens without ruining them.
Dry cleaning is the most effective single treatment and the safest choice for structured wool garments like suits, blazers, and coats that you can’t afford to risk shrinking. The solvents and heat involved kill larvae reliably.
Cleaning Out Your Closet
Killing larvae on individual garments only solves half the problem. A single adult female moth lays 40 to 50 eggs, each about the size of a pinhead, and she deposits them directly on vulnerable fabrics. If you treat one sweater but ignore the rest of the closet, you’ll find new holes within weeks.
Pull everything out of the affected closet or drawer. Vacuum thoroughly, paying close attention to corners, baseboards, cracks, and shelf liners where larvae and eggs can hide. Dispose of the vacuum bag or empty the canister outside immediately. Wipe down shelves and walls. This sounds tedious, but textile conservators at institutions like the Smithsonian Design Museum emphasize that regular monitoring and cleaning are the most important parts of any pest prevention plan.
Preventing Reinfestation
Moths are drawn to dark, warm, humid, undisturbed spaces and to clothing that carries body oils, sweat, or food residue. That combination describes the back corner of most closets perfectly. A few changes make your closet a much less appealing target.
Clean before storing. Never put worn wool, silk, or cashmere back into long-term storage without washing or dry cleaning it first. Even if a sweater looks clean, invisible body oils and skin cells are exactly what larvae feed on.
Use sealed containers. Store off-season woolens in tightly sealed plastic bins or compression storage bags. For hanging garments, use garment bags with no holes, and tape over any seams or joints in the bag. Avoid fabric storage containers, because moths can eat through them.
Keep closets bright and active. Leaving closet doors open, letting light in, and moving clothing around regularly discourages moths. They strongly prefer still, dark environments. If you have wool items you rarely wear, those are the ones most at risk and the ones that benefit most from sealed storage.
Vacuum regularly. Closet floors, shelf edges, and the carpet under furniture are prime egg-laying territory. Vacuuming every few weeks removes eggs and larvae before they establish themselves.
Do Pheromone Traps and Natural Repellents Work?
Pheromone traps use synthetic female moth scent to lure and trap males on a sticky surface. They’re genuinely useful, but not as a standalone solution. By catching males, they disrupt the breeding cycle and gradually reduce the moth population. They also serve as an early warning system: if you’re catching moths in the trap, you know you have an active problem. Place them in closets, drawers, or storage areas where you keep animal-fiber clothing.
Cedar and lavender are traditional moth deterrents, and they do have some repellent properties when fresh. But their effectiveness fades as the scent diminishes, and neither one reliably kills larvae or eggs. Many people find that lavender sachets and cedar blocks slow moths down slightly but don’t stop an established infestation. Think of them as a mild supplement to proper cleaning, storage, and monitoring rather than a solution on their own.
The most effective long-term strategy combines several layers: clean garments before storage, seal vulnerable items in airtight containers, keep closets well-lit and frequently disturbed, vacuum storage areas regularly, and use pheromone traps to catch early signs of a new infestation before it spreads.