Moth Prevention for Wool: What Fall Requires

Moth prevention for wool comes down to one fact that surprises most people: clothes moths do not eat wool for the wool. They eat the perspiration, body oil, and food residue left in the fibers, and they chew through the fiber to reach it. A genuinely clean cashmere sweater is close to inedible. A worn-once sweater put away in June is a meal. That distinction explains nearly every hole discovered in September, and it is the reason fall is the month wool damage gets found rather than the month it happens.

When Does Moth Damage Actually Occur?

Moth damage occurs in the warm months while the garment sits undisturbed, not in the cold months when you are wearing it. Webbing clothes moth larvae feed for roughly two to three months at summer temperatures, and it is the larvae that do all the eating. The adult moth you see flying near a lamp has no working mouth and eats nothing at all, which is why killing the moths you see does not stop the damage. Holes that appear when a coat comes off the rod in September were made in July by larvae that have since matured and moved on.

How Should Wool Be Inspected When It Comes Out of Storage?

Inspect wool in strong daylight, turning each piece inside out and paying attention to folds, underarms, cuffs, and the seat of trousers, since larvae feed in dark, undisturbed areas rather than on exposed surfaces. Look for these specific signs:

• Grazed patches: thinned areas where the surface fiber is eaten but not perforated, often the first stage before an actual hole.
• Silken tubes or webbing: fine casings the color of the fabric, tucked into seams and along collar folds.
• Sand-like grit in the fold: larval waste, usually dyed the same shade as the garment.
• Holes clustered together: moth holes appear in groups in one region; a single isolated hole is usually snag damage instead.
• Bare shoulders on coats: a common feeding site because that is where head oil and hair products collect.

Do Cedar and Lavender Actually Prevent Moths?

Cedar and lavender repel adult moths to a limited degree and kill nothing, so neither one protects a garment that already has larvae in it. Cedar oil loses most of its potency within one to two years, which is why an old cedar closet offers far less protection than owners assume; sanding the interior lightly restores some of the scent. Both are worth using as a secondary measure, and neither is a substitute for the primary one. The single most effective step is having wool professionally cleaned before it is put away, because cleaning removes the food source entirely.

What Should Be Done With Wool Before Fall Storage Rotation?

Clean every wool piece before it goes into storage, and clean the pieces coming out before you wear them again if they were stored soiled. Vacuum the closet floor, corners, and shelf edges, since eggs and larvae survive in lint and dust rather than only on garments. Store wool in breathable cotton garment bags, never sealed plastic, which traps humidity and encourages mildew on the fibers moths have already weakened. Sweetwater's Cleaners offers seasonal storage starting at $55 and climate-controlled cold storage starting at $115 per season, which keeps wool below the temperature at which larvae can feed at all.

Can Moth Holes Be Repaired?

Small moth holes can often be repaired invisibly by reweaving, in which yarn taken from a seam allowance or hem is woven back into the damaged area by hand. Reweaving works best on holes under about a quarter inch in tightly woven wool, suiting, and coating; loose knits and large grazed areas are usually better served by a well-placed patch or by accepting the wear. Bring the garment in before wearing it further, because a hole under tension widens quickly and a quarter-inch hole is a very different repair from a one-inch one.

At Sweetwater's Cleaners, wool coats, suits, and fine knits are cleaned and inspected individually each fall, with damage flagged before storage and every garment hand pressed as French-style cleaning requires. Moth prevention for wool works when it happens in September rather than after the first cold week. Our Wainscott shop on the Montauk Highway serves the Hamptons.