The Quiet Discipline of Wool: A Season-by-Season Guide to Sweater and Wool Coat Care

Wool rewards patience. Here is how to wash, dry, store, and restore your sweaters and wool coats so they keep their shape, softness, and years of service.

Can you machine wash a wool sweater? In most cases, no. Standard washing machines agitate too aggressively and use water that's too warm, which is the fastest route to felting. The safer method is hand washing in lukewarm water with a gentle, wool-specific detergent. Submerge the sweater, press water through it gently, and never wring or twist.

Cashmere sweater care follows the same principle, with even less tolerance for error. Cashmere fibers are finer and more delicate than standard wool, so use a shorter soak, cooler water, and handle the garment as little as possible while wet. If your washing machine has a genuine wool cycle with a cold setting and minimal spin, it can work for sturdier wool knits, but when in doubt, wash by hand.

Wool coats are a different matter entirely. Their structure, often including interfacing, linings, and tailoring, cannot tolerate water the way a knit can. Wool coat dry cleaning uses solvents instead of water, lifting oils and odors without disturbing the garment's shape or the bonds holding it together.

How often should you dry clean a wool coat? Once or twice per season is generally sufficient, more for heavy wear, less if the coat is mostly stored. Over-cleaning wears down fibers unnecessarily. Does dry cleaning shrink wool? Done properly, no. Professional solvents and controlled temperatures are specifically chosen to avoid the heat and agitation that cause shrinkage. Shrinkage happens when wool is mishandled, not when it's professionally cleaned.

Fresh stains should be blotted, never rubbed, and treated as soon as possible. For set-in stains or anything oil-based, professional treatment is safer than risking a DIY fix that sets the mark permanently. Odors often respond well to simple airing out in a well-ventilated room away from direct sun, which allows wool's natural fibers to release trapped scent without any washing at all.

Removing pilling from sweaters is a matter of the right tool and a light touch. A fabric shaver or fine-tooth comb, used in short, gentle strokes, lifts the pills without thinning the knit. Avoid scissors and aggressive scrubbing, both of which damage fibers and invite more pilling later.

Heat is wool's real enemy, far more than water itself. Never tumble dry a wool sweater or coat. Instead, press excess water out gently with a towel, then lay the garment flat on a dry towel, reshaping it to its original dimensions. Let it air dry completely before moving it.

Hanging a wet wool sweater will stretch it permanently under its own weight. Flat drying, though slower, is the only way to preserve both size and shape. Coats should air dry on a sturdy, wide hanger, away from direct heat sources or sunlight.

How to store wool sweaters properly starts with folding, never hanging. Hanging stretches the shoulders and distorts the shape over time. Fold sweaters and place them in a breathable container, away from humidity and direct light.

Wool coat storage tips follow similar logic at a larger scale: use broad wooden or padded hangers that support the shoulder line, keep coats in breathable garment bags rather than plastic, and store in a cool, dry space with cedar blocks or lavender sachets to deter moths. Clean garments before long-term storage; moths are drawn to body oils and residue, not the wool itself.