Wool and Cashmere Sweater Care: The Complete Guide to Keeping Knits Beautiful

Wool and cashmere fibers are covered in microscopic scales that lock together under heat, agitation, and friction. That's what causes shrinking and felting in a regular washing machine. Cashmere is even more delicate than sheep's wool, with finer, shorter fibers that break down faster if handled roughly.

This isn't about being precious for its own sake. A little extra care at each step, washing, drying, and storing, protects the loft, softness, and drape that made you fall in love with the sweater in the first place.

Before you do anything, check the label. "Dry clean only" usually means the garment has structural details, like shoulder pads, linings, or embellishments, that won't survive water. "Hand wash" or "dry clean and hand wash" gives you more flexibility to care for the piece at home.

Look out for symbols too: a hand in a basin means hand wash, a circle means dry clean, and a flat icon means dry flat rather than hang. When in doubt, treat the sweater as if it's more delicate than the label suggests. It's easier to be gentle than to undo damage.

Yes, you can wash wool and cashmere sweaters at home, and hand washing is the safest method for most knits without structural detailing. Fill a basin with lukewarm water and a wool-specific detergent, avoiding regular detergent, which can strip natural oils from the fibers.

Submerge the sweater and gently press the water through the fabric. Never rub, wring, or twist. Let it soak for five to ten minutes, then rinse with water of the same temperature until the soap is gone. Sudden temperature changes are what cause felting, so keep every step consistently lukewarm.

If hand washing feels risky for a special piece, a gentle machine cycle in a mesh bag on a wool setting can work for sturdier wool sweaters, but cashmere and fine-gauge knits are safest done by hand.

The best way to dry a cashmere sweater is flat, never on a hanger, and never in a tumble dryer. Hanging causes the wet fibers to stretch under their own weight, leaving you with sleeves down to your knees.

After washing, lay the sweater on a clean towel, roll it up to press out excess water, then unroll and reshape it on a fresh dry towel or a mesh drying rack. Ease it back into its original dimensions, smoothing the shoulders and cuffs, and let it air dry away from direct heat or sunlight. This can take a day or two, so patience matters as much as technique.

If you'd rather not risk it, this is exactly the kind of finishing work a professional dry cleaner does daily, reshaping and blocking each knit by hand.

Pilling happens naturally from friction, under arms, at cuffs, along the sides where a bag rubs. The good news is that pilling doesn't mean the sweater is worn out; it just needs a little grooming.

To remove pilling from a wool sweater, lay it flat and use a fabric shaver or a fine-tooth comb, working gently in one direction with light pressure. Avoid sawing back and forth, which can thin the fabric. For a low-tech option, some people use a disposable razor at a shallow angle, but this requires a very light touch to avoid nicking the knit.

Do this on a flat, taut surface, never while the sweater is being worn, and check your work in good light to avoid overdoing it in one spot.

Never hang wool or cashmere sweaters; hangers stretch out the shoulders and create odd points at the neckline. Fold them instead, and store in a breathable cotton bag or drawer rather than sealed plastic, which can trap moisture and encourage mildew.

Moths are drawn to the natural oils and food residue left on unwashed wool, so always launder or dry clean sweaters before putting them away for the season. Cedar blocks, lavender sachets, or dedicated moth deterrents in the storage area add another layer of protection.

For long-term storage, a professional clean beforehand ensures every trace of oil, sweat, and food is gone, so your sweaters come out of storage next winter exactly as soft and intact as they went in.