Cashmere and Wool Knitwear Care

Understanding the Fibres: Why Cashmere and Wool Are Different

Cashmere and wool share a common origin as animal fibres, but their characteristics and care requirements differ significantly. Cashmere is harvested from the undercoat of cashmere goats, producing fibres that are significantly finer — typically fourteen to nineteen microns in diameter — than sheep's wool, which ranges from twenty to thirty microns. This fineness gives cashmere its signature softness, but it also makes the fibres more delicate and prone to pilling, stretching, and damage from friction. Wool, particularly in higher grades such as Merino, is more resilient due to the natural crimp in each fibre that provides elasticity and memory. Lambswool is coarser still and more durable but can feel scratchy against sensitive skin. Understanding these structural differences is the foundation of proper care — what works for a hardy wool sweater may be too aggressive for a delicate cashmere piece, and treating all knitwear the same is a recipe for premature wear and disappointment.

Washing: Hand Washing Is the Gold Standard

Machine washing, even on a delicate cycle, is the leading cause of premature knitwear failure. The agitation stretches and distorts the fibres, while the spin cycle felts the wool or cashmere, causing shrinkage and loss of softness. Hand washing is simple and far safer. Fill a basin with lukewarm water — around thirty degrees Celsius — and add a small amount of wool-specific detergent. Never use regular laundry detergent, which contains enzymes that break down animal fibres. Submerge the garment and gently press it underwater without scrubbing, wringing, or twisting — these actions permanently deform the knit structure. Let it soak for ten to fifteen minutes, then drain the soapy water and refill with clean lukewarm water to rinse. Repeat the rinse cycle until no soap residue remains. Press the water out gently by rolling the sweater in a clean, dry towel — never twist or squeeze. Reshape the garment to its original dimensions while it is still damp and lay it flat to dry on a mesh drying rack away from direct sunlight and heat sources.

Dealing with Pilling: Prevention and Removal

Pilling — the formation of small fibre balls on the surface — is the most common complaint about cashmere and fine wool knitwear. It is not a sign of poor quality but a natural consequence of fibre friction, particularly in areas where the sweater rubs against itself, a jacket lining, or a bag strap. Prevention starts with wearing a thin cotton undershirt beneath your sweater to reduce oil and friction transfer from your skin. Washing less frequently also reduces pilling, as the agitation of washing can raise loose fibres. When pills do appear, remove them with a fabric comb or a cashmere comb — a fine-toothed tool designed to gently lift pills without cutting the fibres. Electric fabric shavers should be used with extreme caution on cashmere, as they can easily remove too much fibre and create thin spots. For wool, a sweater stone gently buffs away pills without the risk of cutting. Regular gentle depilling every few wears keeps knitwear looking fresh and prevents pills from becoming matted into the fabric, which is much harder to remedy.

Drying and Ironing: The Rules of Heat

Heat is the enemy of animal fibres, and the rules around drying and ironing reflect this. Knitwear should never be placed in a tumble dryer — the combination of heat and mechanical agitation causes irreversible shrinkage and felting. Always dry flat on a mesh rack or a clean towel, reshaping the garment to its original measurements while damp. Turning the sweater over halfway through drying ensures both sides air evenly. Drying can take twelve to twenty-four hours depending on the knit density and room humidity. If you need to speed the process, place the sweater near a fan but never on a radiator or in direct sunlight. For ironing, use a low-heat setting suitable for wool and always place a pressing cloth — a thin cotton handkerchief or muslin — between the iron and the knitwear. Better still, use a handheld steamer held at least five centimetres from the fabric. Steam relaxes the fibres and removes wrinkles without the compression and heat damage of an iron. Hanging knitwear to steam in the bathroom during a hot shower is a gentle alternative that works for light creases.

Storage: Protecting Against Moths and Distortion

Storing knitwear incorrectly can undo months of careful washing and drying. The cardinal rule is to fold knitwear, never hang it. Hangers stretch the shoulders of a sweater within days, creating permanent bumps that cannot be reshaped. Fold sweaters with acid-free tissue paper between the folds to prevent crease marks and store them flat in a drawer or on a shelf. For seasonal storage, add cedar blocks or lavender sachets to the storage area — these natural repellents deter clothes moths, which lay eggs in animal fibres and whose larvae eat holes through cashmere and wool. Avoid mothballs, which contain naphthalene and leave a persistent chemical odour that is difficult to remove. Vacuum-sealed storage bags are acceptable for off-season storage but ensure the knitwear is completely dry before sealing to prevent mildew. Check stored knitwear every few months during the off-season to catch any moth activity early — an infestation that goes unnoticed can destroy an entire collection of sweaters in a single season.

Repairing Damage: Small Fixes That Extend Life

Small holes, loose threads, and frayed cuffs do not mean the end of a beloved sweater. A pulled thread can often be gently coaxed back into place using a fine knitting needle or a dental floss threader. Small holes in cashmere can be repaired with visible mending — using matching yarn in a Swiss darning technique that reinforces the area while being nearly invisible. Most dry cleaners offer basic knitwear repair services for ten to thirty dollars, including reweaving small holes and reinforcing weakened elbows and cuffs. For more significant damage, specialist knitwear repair services can reknit entire panels to match the original stitch pattern. This is often worth the cost for high-end cashmere pieces that would cost several hundred dollars to replace. Adding elbow patches to wool sweaters with thinning elbows is both practical and stylish, extending the garment's life while adding a traditional academic aesthetic. Between professional repairs, trim loose threads with small scissors — pulling them can unravel entire sections of stitching.