Clothes moths and cashmere: the winter storage guide

A twelve-ply cashmere jumper folded away in the dressing room of a Riviera residence, a wardrobe of wool overcoats closed from November to April, silk squares tucked into an antique chest of drawers: that, quite precisely, is the ideal larder for clothes moths. Every spring, our technicians are called into Monaco apartments and coastal villas to record the same damage: clean holes through fine knits, galleries chewed through felts, collars devoured from the inside. And every time, the same conclusion: everything was decided at the moment the house was closed up, six months earlier. This guide covers the life cycle of the two species responsible, the textiles genuinely at risk, and above all the complete winter storage protocol we deploy in private villas and the great apartments of the Principality — a protocol your household team can take over, task by task.

Why the Riviera is perfect territory for clothes moths

The Mediterranean climate is a blessing for exceptional wardrobes — and for what eats them. Clothes moths thrive between 20 and 30 °C with moderate to high humidity: conditions the coast delivers eight months out of twelve, and which heated interiors extend right through winter. Where a harsh continental winter naturally slows breeding cycles, a Monaco dressing room held at 21 °C lets larvae feed without interruption, generation after generation.

Add to this a decisive local factor: the seasonality of residences. A significant share of Côte d'Azur apartments and villas are occupied only a few months or even weeks per year. A wardrobe that sleeps for six months in darkness — no doors opening, no air movement, no inspection — offers moths exactly what they seek: darkness, stillness and an inexhaustible source of keratin. Moths flee light and disturbance; a garment worn and brushed regularly is almost never attacked. A forgotten garment almost always is.

Finally, the density of noble textiles per square metre is unmatched here. Cashmere, vicuña, alpaca, mohair, silk, Oriental rugs, horsehair-stuffed armchairs: a single residence can hold more keratin fibre than an entire building elsewhere. For an insect whose larva eats nothing else, the Riviera is an open table.

Know your enemy: Tineola bisselliella and Tinea pellionella

Two species account for most of the damage we see on our call-outs. The first, Tineola bisselliella, the webbing clothes moth, is a small golden-beige moth of 6 to 8 millimetres with fringed wings; it shuns light and flies little — the moths you see fluttering are usually males, because the females, heavy with eggs, prefer to scurry into the folds and hide. The second, Tinea pellionella, the case-bearing clothes moth, is recognisable by one telltale detail: its larva builds a portable case of silk and nibbled fibres that it carries everywhere, like a sheath, retreating inside it at the slightest threat.

The crucial point most people miss: the adult moth eats nothing. Its mouthparts are atrophied; it lives about a fortnight, just long enough to reproduce. All the damage — every last hole — is the work of the larvae. A female lays 50 to 100 eggs, minuscule at under half a millimetre, deposited directly into the fibres: deep in a fold, under a collar, inside a coat lining. Depending on temperature, the eggs hatch in one to three weeks, and the larvae then feed for anywhere from two months to two years before pupating. That elastic cycle explains the nasty surprises: a garment contaminated in September can look intact at Christmas and be riddled with holes by March.

At heated dressing-room temperatures, expect two to four generations a year. An infestation that starts with a single female in October can therefore mean several hundred larvae by the following spring. This is why our dedicated page on clothes moths insists on one principle: with moths, early diagnosis makes all the difference.

Cashmere, wool, silk: why your finest pieces are targeted first

Moth larvae digest keratin, the protein that makes up hair, wool, feathers and fur. And the finer and less processed a fibre, the more digestible it is. Cashmere — goat underdown of 14 to 16 microns — is from this standpoint the perfect food: tender, rich, stripped of the coarsest guard hairs. Vicuña and baby alpaca follow immediately. Merino wool comes next, then the more rustic wools.

Silk is a special case: it is made not of keratin but of fibroin, another animal protein. Larvae consume it less readily, but they will cut through and damage it without hesitation when it is blended with wool, backed with horsehair or simply stained. And this deserves emphasis: moths have a marked weakness for soiled textiles. A trace of perspiration, a drop of perfume, an invisible food residue supplies the moisture and mineral salts a larva needs to round out its diet. A jumper worn just once and then stored for six months is statistically far more likely to be attacked than one cleaned before storage.

Conversely, cotton, linen and synthetic fibres do not nourish larvae. But beware of hasty conclusions: a cotton garment stored against an infested cashmere jumper can be holed "in passing", and wool-synthetic blends are attacked for their wool content. In a wardrobe, you must always think at the scale of the entire cabinet, never the single garment.

Spotting an infestation before it is too late

The signs, in order of appearance. First, the adult moths: small golden lepidopterans that flutter up weakly when you open a wardrobe, or turn up dead on shelves. Their presence signals active breeding, and therefore recent egg-laying. Next, larval traces: silk threads webbed across the knit, small tubes or cases the colour of the attacked garment — the signature of Tinea pellionella — and fine sand-like grains, which are larval droppings tinted the colour of the fibres consumed. Finally, the damage itself: areas where the knit is thinned, as if shaved, then clean holes with irregular edges, often clustered where the fabric folds.

Three simple checking habits to pass on to your household staff. One: inspect first whatever never moves — the back of shelves, the garments at the bottom of piles, the inside of folded sleeves. Two: hold fine knitwear up against the light, because thinning of the knit shows through before an actual hole appears. Three: do not forget furnishing textiles — rugs under furniture, the undersides of wool armchairs, lined curtains, blanket chests. On that last point, the issue converges with collection-grade pieces, which we cover in depth in our article on precious rugs and textile reserves.

The classic mistake: spraying without a diagnosis

Faced with the first moths, the most common reflex is also the most counterproductive: buying an insecticide aerosol and spraying the wardrobe. The result is threefold, and bad three times over. First, the aerosol kills the visible moths — which, remember, eat nothing and were about to die anyway — but reaches neither the eggs nestled in the fibres nor the larvae sheltered deep in folds and linings. Second, it deposits solvents and active substances onto delicate textiles where they have no business being, with the risk of rings on silk and persistent odours on absorbent fibres like cashmere. Third, it creates a wholly unfounded sense of security: the wardrobe is closed again in the belief it has been treated, and the larvae carry on their work in silence.

Our method starts at the exact opposite end: with the diagnosis. Which species? What extent? Which hotspots? A professional inspection maps the infestation — wardrobes, but also rugs, skirting boards, ventilation grilles, attic spaces where an old bird's nest or animal-fibre insulation can act as a reservoir. Because this is a constant of our residential work: the dressing room is often only the visible part. As long as the primary source — a rolled rug in a cellar, a horsehair armchair in an attic, animal-fibre insulation — is not identified and treated, recontamination follows recontamination, season after season. Remove the cause before treating the symptom: our entire protocol fits into that sentence.

The season-closing protocol, step by step

Here is the framework we apply — and audit — in the seasonal residences of the coast. Ideally it runs over two weeks, before the house is closed.

Step 1: sorting and complete cleaning. No garment goes into storage without being cleaned — even worn only once, even visibly spotless. Dry cleaning eliminates eggs and young larvae; washing at 40 °C or above does the same for pieces that tolerate it. It is the least spectacular step and the most decisive: it removes both existing egg-lays and the soiling that attracts future ones.

Step 2: cold for the delicate pieces. For precious textiles that tolerate neither hot washing nor repeated dry cleaning — certain cashmere knits, antique pieces, fur accessories — preventive freezing is the ultimate weapon: the garment, sealed in an airtight plastic bag to prevent condensation, spends a minimum of 72 hours at −18 °C. Eggs, larvae and pupae are destroyed without the slightest chemical residue. The bag is then allowed to return to room temperature before opening, so condensation forms on the plastic and not on the fibre.

Step 3: the airtight container. Full-zip garment bags in thick fabric, rigid gasketed boxes, vacuum bags for pieces that tolerate compression — never for structured jackets or the finest knits, which would crease. The principle is simple: a female moth cannot lay on what she cannot reach. Thin dry-cleaner's plastic covers, on the other hand, should be banned for long-term storage: neither airtight nor breathable, they combine every defect.

Step 4: sanitising the original container. While the garments are protected, the wardrobe itself is treated: meticulous vacuuming of every surface, groove, shelf-peg hole and skirting board — with the vacuum bag removed from the house immediately afterwards — then steam cleaning of corners and backs. Larvae readily pupate away from the garments, in the crevices of the furniture: neglect them and you re-seed the wardrobe upon reopening.

Step 5: controlled dormancy. Humidity held below 55 % — moisture absorbers or a dehumidifier depending on volume — temperature as low as practical, pheromone traps placed at strategic points, and a documented monthly inspection routine for the household team. The wardrobe enters winter storage the way a yacht enters refit: cleaned, protected, monitored.

Pheromone traps: your alarm system, not your treatment

A pheromone trap releases a synthetic copy of the sex hormone emitted by the female. Males are drawn in and stick to the glue board. Used properly, it is a remarkable tool — provided you understand what it does and what it does not do.

What it does: detect. A trap that stays empty for months confirms the dressing room is healthy. Three captures in a week signal active breeding somewhere in the room, often before any visible damage. By comparing counts across several traps, you can even triangulate the hotspot. That is exactly how we use them in our monitoring plans: as a network of detectors, read and dated at every visit.

What it does not do: eradicate. The trap captures only adult males; it reaches neither females, nor eggs, nor larvae — that is, neither the egg-laying under way nor the damage under way. A female fertilised before the trap was set will lay her full clutch, trap or no trap. Treating a pheromone trap as a treatment is one of the most frequent mistakes we encounter; it is a thermometer, not a remedy. In practice: one to two traps per dressing room, placed at wardrobe height, replaced as directed — the pheromone is exhausted within eight to twelve weeks — and read monthly with the count written down. Any capture triggers an inspection; repeated captures trigger a phone call.

Seasonal residences: coordinating housekeeping, butler and contractor

In a great house, protecting the wardrobe is not a task but a chain of responsibility. Our experience of the coast's private properties has taught us that a protocol is only as good as the clarity of its division of labour. Here is the split that works.

To the housekeeper or housekeeping team: the textile calendar. Rotating and brushing worn pieces, weekly visual checks of wardrobes in season, execution of the closing protocol — sorting, dispatch to the dry cleaner, bagging — and monthly off-season reading of the pheromone traps with written records: date, location, number of captures. That register, whether a simple sheet or a shared app, is the backbone of the whole system: it turns impressions into data.

To the butler or estate manager: coordination and arbitration. He or she triggers the professional inspection when a capture occurs, schedules the mid-winter visit — January is the right moment — and ensures the house's incoming flows — building works, deliveries of antique furniture, returns from storage — do not reintroduce the problem. Because an antique rug bought at auction or an armchair back from restoration are classic infestation vectors: every incoming textile should pass through quarantine — inspection, and freezing if needed — before joining the living quarters.

To the certified contractor: diagnosis, treatment of hotspots, the closing audit and traceability. Every visit we make is documented in a systematic report: zones inspected, captures recorded, actions taken, recommendations. When the house reopens in spring, that file lets you open the wardrobes with confidence — and prove, to an insurer if ever needed, that the wardrobe was kept with diligent care.

Treating without polluting: non-toxic solutions first

In a dressing room, treatment and skin could hardly be closer: whatever touches the garment will touch its wearer. Our doctrine is therefore constant: non-toxic first, chemical as a last resort, and never in direct contact with the textiles.

Physical weapons are the safest and, used well, the most effective. Cold — −18 °C, 72 hours minimum — destroys every life stage without residue. Heat does the same: a pass through a heat chamber above 55 °C, or steam cleaning for furniture and rugs, kills eggs and larvae instantly. Light and movement complete the arsenal: brushing a coat outdoors, airing a piece for a few hours in sun and fresh air, vacuuming methodically — the fragile larvae do not survive repeated disturbance.

Natural repellents — cedar wood, lavender, herb sachets — deserve an honest clarification: their scent disrupts the females' search for an egg-laying site, but kills nothing. A cedar block sanded regularly — the oil evaporates within months — is a pleasant complement in a healthy wardrobe; it will do nothing against an established infestation. As for the mothballs of old, they no longer belong in a home: toxic to occupants, stubbornly odorous, they belong to the past.

When a confirmed hotspot demands a biocidal treatment — skirting boards, under fitted carpet, attic spaces — it must be applied by a professional holding Certibiocide certification N°121134, to the structure and never to the clothes, using products chosen for their toxicological profile and with re-entry intervals respected. That is the guarantee of a treatment that works where it must — and only where it must.

The cost, compared with doing nothing

Let us do the arithmetic our clients always do too late. On one side: a closing audit, a few hours of protocol executed by a trained team, garment bags and traps renewed each season. On the other: a wardrobe assembled over years, pieces in rare fibres some of which can no longer be found, knits whose artisanal reknitting — where it is even possible — demands weeks in a workshop, coats whose linings and interfacing must be opened up to gauge the extent of the galleries. Not to mention the rugs, armchairs and curtains, whose restoration is the province of craft ateliers with full order books.

The rule is universal and, in our experience, admits no exception: the audit always costs less than the repair. And there is what repair never gives back: the inherited piece, the garment tied to a memory, the unfindable. A moth infestation rarely destroys replacement value; it destroys irreplaceable value.

So where to begin? Three ideas to hold on to. One: spring damage is decided in autumn — the season's closing is the strategic moment, and cleaning before storage is the single gesture that changes everything. Two: pheromone traps monitor, cold and heat treat, professional diagnosis directs; none of the three replaces the other two. Three: in a staffed residence, wardrobe protection is a written, shared protocol — not a good intention.

If your house closes in autumn, if a doubt hangs over one wardrobe, or if you simply wish to have your current protocol audited before the storage season, our technicians operate throughout Monaco and along the coast with the discretion the properties we serve demand. The first step is simple and without obligation: a free quote request, followed by an inspection that will tell you precisely where you stand. Your cashmeres have crossed the years; a well-prepared winter will carry them across many more.

Zones served in Monaco and on the Riviera

We operate in particular on Nice and Villefranche-sur-Mer.