Clothes moths are small, plain-colored moths that avoid light and hide in closets, drawers, and dark corners of rooms. Unlike the moths you see fluttering around porch lights at night, clothes moths actively avoid bright areas, which is why infestations often go unnoticed until you discover damaged clothing. Two species cause virtually all fabric damage in homes: the webbing clothes moth and the casemaking clothes moth. Telling them apart, and distinguishing their damage from other pests, comes down to a few reliable visual clues.
The Two Species You’ll Find in Your Home
The webbing clothes moth is the more common of the two. Adults are small, roughly 1/4 inch long, with uniform golden or buff-colored wings that lack any spots or markings. Their heads have a tuft of reddish-gold hair. They are weak, fluttery fliers that tend to hop or scurry along surfaces rather than take sustained flight. If you see a small, plain gold moth darting away from light inside a closet, this is almost certainly what you’re looking at.
The casemaking clothes moth is slightly less common but causes the same type of damage. Adults are similar in size but have brownish wings with three faint dark spots. In practice, those spots can be hard to see without magnification, so the most reliable way to tell the two species apart is by looking at larval evidence rather than the adults themselves.
How to Identify the Larvae
It’s the larvae, not the adult moths, that eat your fabrics. Both species produce small, creamy-white caterpillars with dark head capsules. They’re tiny, typically under 1/2 inch long when fully grown. You’re unlikely to see them crawling around in the open because they stay on or near the material they’re feeding on, usually tucked into folds, seams, or the underside of collars.
The key difference between the two species shows up in how the larvae protect themselves while feeding. Webbing clothes moth larvae spin loose silken tubes and mats directly on the fabric surface. They feed from beneath these silk patches, then abandon them when they move to a new spot. You’ll find these leftover tubes and webbing stuck to fabric, often incorporating tiny bits of fiber and excrement. The casemaking clothes moth larva, by contrast, builds a portable cigar-shaped silken case about 3/8 inch long and drags it everywhere it goes. It feeds from either end of this case and retreats inside when disturbed. If separated from its case, the larva dies. As it grows, it adds material to both ends, enlarging the case over time.
One useful detail: the cases and excrement of both species take on the color of the fabric the larvae have been eating. A larva feeding on a blue wool sweater will produce a bluish case and blue-tinged droppings. This camouflage effect means you need to look carefully, since evidence of feeding can blend right into the garment.
Signs of an Active Infestation
You may never see a live larva and still have clear evidence of an infestation. Here’s what to look for:
- Silken tubes or mats on fabric. Check hidden areas: under collars, inside cuffs, along seams, and on the underside of rugs or carpets. These silk structures often have tiny fibers and sand-grain-sized droppings woven into them.
- Small cigar-shaped cases. If you find open-ended silk tubes about 3/8 inch long attached to fabric, you’re dealing with casemaking clothes moths. The case may be stuck to the material at one end.
- Irregular holes or surface grazing. Clothes moth larvae tend to graze across a surface, leaving shallow furrows or thin spots rather than clean-cut holes. Casemaking moth larvae in particular often create surface damage without eating all the way through.
- Trails across wool or fur. On items like fur coats, larvae leave visible trails and remove hair at the base, creating bare patches.
- Tiny droppings matching the fabric color. Because the droppings are dyed by the fibers the larvae eat, they can be hard to spot. Run your fingers along seams and folds, feeling for gritty residue.
Clothes Moths vs. Carpet Beetles
Carpet beetles cause similar damage to natural fibers, and the two pests are often confused. The distinction matters because they behave differently and require different approaches to control. Carpet beetle larvae are covered in tiny hairs or bristles and do not produce any silk webbing, cases, or cocoons. If you find silk on the damaged fabric, you have clothes moths, not carpet beetles.
Carpet beetle larvae also wander. They crawl from room to room and can show up in places with no food source at all. Clothes moth larvae, on the other hand, stay put on whatever they’re eating. If you find larvae right on the damaged garment, clothes moths are the more likely culprit. As carpet beetle larvae grow, they shed their skins repeatedly, and these cast skins look remarkably like living larvae, which can make an infestation seem larger than it is. Carpet beetles also leave behind small, hard fecal pellets near feeding sites, but without any silk.
What Clothes Moths Eat
Clothes moth larvae feed on keratin, a protein found in animal-based fibers. Wool, cashmere, silk, feathers, fur, and leather are all targets. They’ll also eat fabric blends that contain wool, and they’re drawn to items soiled with food stains, sweat, or body oils, which provide additional nutrients and moisture. A clean wool sweater stored properly is at much lower risk than a worn one stuffed in the back of a closet.
Pure synthetic fabrics like polyester and nylon aren’t at risk on their own. But synthetics that are heavily soiled or blended with natural fibers can still attract larvae. The moths also prefer low-light conditions and undisturbed areas, which is why rarely worn garments, stored rugs, and forgotten boxes of woolens are prime targets. Tapestries, upholstered furniture with natural fiber coverings, and wool carpets (especially under heavy furniture where vacuuming doesn’t reach) are common feeding sites that people overlook.
Where to Inspect
Start with the places you look at least. Clothes moths thrive in dark, still, undisturbed environments. Pull garments out of closets and check inside folds, under collars, and along seams where larvae hide. Look at the backs and undersides of wool rugs, particularly near walls and under furniture. Check stored items like off-season coats, blankets in guest rooms, wool hats, and vintage clothing that hasn’t been worn in months.
Don’t forget non-obvious sources. Piano felts, taxidermy, feather pillows, fur trims on accessories, and even natural-bristle brushes can harbor larvae. Lint and pet hair that accumulates in floor cracks, air ducts, and behind baseboards can also sustain a small population of clothes moths indefinitely, because this debris contains enough keratin to keep larvae alive between meals on your wardrobe.
If you spot adult moths flying in a room, they’ve likely already laid eggs nearby. Adults don’t feed on fabric (they don’t eat at all, in fact). Their only purpose is to mate and lay eggs, so the presence of even one adult means larvae are probably already at work somewhere out of sight.