Wool knitwear keeps its shape if you stop hanging it and start resting it
Wool resists odour better than most fibres, so airing on a chair overnight after wear handles most of what people wash for. When a wash is due, cool water, a wool detergent, and immersion without agitation is the method. Heat plus movement is what felts wool: the scales on the fibres lock and the garment shrinks into a denser, smaller version of itself, permanently.
Lift the wet sweater supported, never by the shoulders, because water weight in a knit is the strongest stretching force it will ever meet. Roll it in a towel to press water out. Wringing twists loops out of true and the garment dries in whatever shape the twist left.
Washing: less often, cooler, and never wrung
Lay the sweater on a dry towel and set its shape with your hands: shoulders at their true width, sleeves straight, hem even, measurements matching a sweater that fits you well if you are unsure. The knit dries into the shape it is given. This is the one moment in the garment's life where a stretched cuff or a grown body can be coaxed back, simply by blocking it smaller and letting it dry there.
Keep it away from radiators and direct sun while it dries. Fast, hot drying is felting's other route, and it fades dye unevenly into the bargain. A day of flat drying in moving air is the price of a sweater that still fits next winter.
Drying flat is a shaping step, not a waiting step
Fold knitwear, always, with tissue in the folds if the knit is fine. A season on a hanger will stretch the shoulders of even a well made sweater, and the little peaks a hanger leaves at the shoulder tips are the signature of that storage, not of poor quality. Drawers and shelves are a knit's home. The rail is for woven cloth, which holds its shape on a frame of seams.
Rest between wears matters for the same reason. Wool fibres recover their crimp given a day or two off, so a sweater worn three days running tires in a way the same sweater in rotation does not. Two or three knits rotated through a week will outlast one favourite worn to exhaustion, even at the same total wears.
Storage and rotation, where the quiet damage happens
Pills are loose fibres tangling on the surface, worst on softer, shorter staple yarns and at friction points under the arms and where a bag strap sits. A battery depiller or a knit comb, used flat and gently, removes them without thinning the fabric. Razors and scissors cut loops as well as pills, and the thin patch that follows cannot be uncut.
A stretched cuff or neckband often recovers with a careful dampening and flat block, because the rib relaxes before it truly deforms. If the elastic in a blended cuff has genuinely gone, a tailor can thread fresh elastic through the rib. It is a small repair that makes a sweater feel new at the exact place you touch it most.
Pills, cuffs, and the small repairs
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Frequently asked questions
How often should wool knitwear be washed?
Far less often than cotton. Air it after wear and wash only when it is actually soiled or has picked up odour that airing does not clear. Every wash is wear on the fibres, and wool's natural odour resistance is the permission to skip most of them.
How often should wool knitwear be washed?
Storage on a hanger is the usual cause: the knit's own weight pulls the loops down month after month. Fold it, and if the shape has grown, a gentle wash followed by flat blocking back to true measurements will recover much of it.
How often should wool knitwear be washed?
True felting, where heat and agitation have locked the fibres, cannot be reversed. Conditioner soaks and stretching rescue borderline cases slightly, but prevention is the real answer: cool water, no agitation, no hot drying.
How often should wool knitwear be washed?
A battery depiller or a fine knit comb, with the garment flat and the tool moved lightly in one direction. Avoid razors and scissors, which cut sound loops along with the pills and thin the fabric permanently.