Protecting Your Cashmere Knits From Moths and Wear

A single female clothes moth can lay up to 300 eggs, and if those eggs hatch in your closet, you aren't just looking at a small hole—you're looking at a destroyed $400 Loro Piana sweater. This guide covers how to identify high-quality cashmere, how to store your knits to prevent pest damage, and how to actually clean them without ruining the fibers. Most people treat cashmere like a regular sweater, but if you do, you'll be returning it to the store in a heap of pills and holes within a month.

How Do I Tell If My Cashmere Is High Quality?

High-quality cashmere is defined by long, continuous fibers that resist pilling and maintain their shape. I've spent years looking at returns from luxury retailers, and the difference between "budget" cashmere and premium knitwear is immediately obvious once you know what to look for. Cheap cashmere uses shorter, weaker fibers that break easily—this is why your "luxury" sweater starts looking like a fuzzy mess after two wears.

When you're shopping, look for these specific indicators of quality:

• Fiber Length: Long-staple fibers are the gold standard. If the sweater feels scratchy against your skin, the fibers are short and low-grade.
• Weight and Drape: A good cashmere knit should have weight to it. If it feels paper-thin or translucent, it's likely a low-density knit that will lose its shape.
• The "Snap" Test: Gently stretch a small section of the knit. It should spring back immediately. If it stays stretched out, the tension is poor.
• Minimal Pilling: While some pilling is natural, excessive fuzziness right out of the box is a red flag.

Brands like Everlane or Naadam often provide decent mid-tier options, but if you're dropping serious money on Brunello Cucinelli, you're paying for much longer, more resilient fibers. Don't let the brand name fool you—always check the fiber composition. If it's a blend with more than 10% nylon or silk, it's a different beast entirely.

It's worth noting that even the best cashmere requires a different level of care than your cotton tees. You can't just throw a delicate knit into a heavy-duty cycle and expect it to survive. If you've ever struggled with maintaining your other luxury items, you might find my post on keeping jewelry from tarnishing helpful for understanding how delicate textures require specific environments.

How Do I Prevent Moths From Eating My Sweaters?

Preventing moth damage requires a two-pronged approach: eliminating food sources and creating a physical barrier. Moths don't actually eat the fabric; their larvae eat the proteins found in human sweat, skin cells, and food spills left on the garment. If you store a sweater without washing it first, you're essentially setting a dinner table for them.

The most common mistake? Storing clothes in cardboard boxes. Cardboard provides a perfect nesting ground for pests. Instead, use airtight containers. Here is the hierarchy of moth protection:

1. Cedar and Lavender: These are natural deterrents. They don't kill moths, but they make your closet a very unattractive place for them.
2. Airtight Plastic Bins: This is your best defense. If the moth can't reach the fiber, it can't eat it.
3. Vacuum Sealing: For long-term storage (like summer when you're packing away winter knits), vacuum bags are the gold standard. They remove all air and any potential larvae.
4. The Freezer Method: If you suspect an infestation, some experts suggest freezing the garment for 48-72 hours to kill any eggs.

A quick warning: don't rely solely on naphthalene-based mothballs. They smell terrible and can actually leave a scent in the fibers that is nearly impossible to remove. According to the Wikipedia entry on moths, many species are highly attracted to specific scents, so keep your cedar blocks fresh by lightly sanding them once a year to reactivate the oils.

How Should I Wash and Store Cashmere?

You should hand wash your cashmere in cool water using a specialized wool detergent or a pH-neutral soap. Never, under any circumstances, should you put cashmere in a washing machine or a dryer. The mechanical agitation of a machine will break those long fibers, and the heat of a dryer will shrink the garment into a doll-sized version of itself.

The process is tedious, but it's the only way to keep the piece looking new. Here is the proper workflow:

If you find yourself washing your clothes too often, you're actually wearing them out faster. Cashmere is resilient, but frequent washing strips the natural oils from the wool. A good rule of thumb? Unless you spilled something on it or it's visibly dirty, just steam it to refresh it. Steaming is much safer than washing and helps kill any lingering bacteria or tiny pests.

When it comes to storage, folding is non-negotiable. I've seen countless beautiful cashmere sweaters ruined because someone decided to hang them on a wooden hanger. Gravity is the enemy of knitwear. If you hang a heavy cashmere sweater, the weight of the bottom half will pull the shoulders out, creating permanent bumps and a distorted silhouette. This is a common reason for returns in the luxury sector—customers receive a garment that looks "stretched out" even though it's brand new.

If you're looking for a way to refresh your clothes without a full wash, look into a high-quality handheld steamer. It's much more effective than a traditional iron, which can easily scorch or flatten the delicate pile of the wool. A steamer lifts the fibers and helps the garment regain its original shape without the stress of water immersion.

One final tip: always check your "pockets" (the folds of the sweater) before storing. If you're storing things in a drawer, ensure there are no stray threads or loose fibers that could attract pests. A clean environment is the only way to ensure your investment lasts more than one season. Most people treat their clothes as disposable, but if you treat your cashmere like the high-value asset it is, it will easily last you a decade.