How to Care for Your Knitwear: A Complete Guide to Washing, Storing and Restoring Wool Jumpers

A well-made jumper should last for decades, not seasons. That's the whole point of investing in premium British knitwear in the first place — a Shetland sweater knitted in the Borders, or a lambswool crew neck made in Hawick, is built to be worn for years. But longevity isn't just down to the quality of the yarn or the skill of the knitters. How you look after a jumper at home has just as much bearing on whether it still looks and feels new in ten years' time, or worn out in two.

Here's everything worth knowing about washing, drying, storing and reviving wool knitwear.

Do You Really Need to Wash Wool as Often as You Think?

The short answer is no. Wool is naturally self-cleaning to a surprising degree — the fibre's structure resists odour and dirt far better than cotton or synthetic knits. Most jumpers only need washing after four or five wears, and airing out overnight on a hanger between wears is often enough to freshen them up completely.

Over-washing is one of the most common ways knitwear is damaged prematurely. Every wash cycle, however gentle, puts some strain on the fibres, so the fewer washes a garment needs, the longer it keeps its shape.

How to Wash a Wool Jumper Properly

When a jumper does need washing:

- Hand wash where possible. Lukewarm water and a wool-specific detergent (avoid regular biological powders, which are too harsh) is the safest option. Gently submerge and squeeze the water through the knit — never rub, twist or wring.
- If using a machine, use a wool or delicate cycle. Most modern machines have one. Turn the jumper inside out, use a mesh laundry bag, and stick to a cold or 30°C setting.
- Rinse thoroughly. Any leftover detergent can leave wool feeling stiff or slightly sticky once dry. This doesn't mean put on a spin cycle to dry it out – it will shrink the garment. The least amount of spin is best.
- Never wring the water out. Instead, lay the jumper flat on a clean towel, roll the towel up, and press gently to draw out excess moisture.

Drying: The Step Most People Get Wrong

This is where more jumpers are ruined than in the wash itself. Wool loses its shape when wet and will stretch permanently if hung up or left in a position where gravity can pull at it.

Always dry knitwear flat, on a clean towel, reshaping it gently to its original dimensions as you lay it out — smoothing the shoulders, cuffs and hem back into place. Keep it away from direct heat (radiators, tumble dryers, direct sun), which can cause the fibres to felt, shrink or lose their softness. Flat drying out of direct sunlight, turned once halfway through, is the standard for a reason: it's slow, but it's the only way to guarantee the garment keeps its shape.

Dealing with Pilling

Pilling — those small balls of fibre that form on the surface of a knit — is a natural result of friction, particularly under arms, at cuffs, and wherever a bag strap or seatbelt rubs. It's more common with softer, finer wools and isn't a sign of poor quality; if anything, the softest yarns are often the ones most prone to it.

A wool comb or a fabric shaver is the safest way to deal with it. Work in one direction, in short, light strokes, rather than scrubbing back and forth, which can thin the knit unevenly. Doing this every few wears keeps pilling from building up and keeps the fabric looking crisp rather than tired.

Storing Knitwear Correctly

Never hang jumpers on a hanger — over time, the weight of the garment stretches the shoulders and neckline out of shape, which no amount of washing will fix. Always fold.

A few storage habits worth adopting:

- Fold jumpers and store them flat in a drawer or on a shelf, rather than stacked more than four or five high, which can crush the knit.
- Use breathable cotton storage bags for out-of-season pieces, not sealed plastic, which traps moisture and can encourage mustiness.
- Add cedar blocks or lavender sachets rather than mothballs — they deter moths just as effectively without the smell, and cedar has the added benefit of absorbing a little moisture.
- Make sure jumpers are completely clean before long-term storage. Natural oils and any trace of food or drink are what attract moths in the first place — not the wool itself.

A Few Signs of Genuine Quality

Understanding care also comes down to understanding what you're caring for. Fine lambswool, superfine merino and Shetland wool all behave slightly differently:

- Lambswool is soft from the first shear of a lamb, giving it a particularly fine, elastic quality that recovers its shape well after washing.
- Merino is prized for being both warm and lightweight, with fibres fine enough to be worn next to skin without irritation — it also regulates temperature well, making it a genuinely versatile choice across seasons.
- Shetland wool has more texture and body, with a slightly coarser hand that's part of its rustic character rather than a flaw — it holds its shape well and softens gradually with wear.

Whichever you own, the underlying principle is the same: wash rarely, dry flat, store folded, and treat pilling as routine maintenance rather than a problem. Do that, and a well-made jumper will comfortably outlast fashion cycles — which, ultimately, is the entire argument for buying fewer, better things in the first place.