How to Prevent Clothes From Shrinking (and Rescue a Shrunken Sweater or Shirt)

Your favorite sweater went into the laundry as a medium and came out looking like it belongs to a teddy bear. Can you save it? Sometimes. A slightly tightened washable knit may respond to gentle damp reshaping. But fabric that has permanently contracted, or wool that has felted, may never return to its original size. This guide is for anyone who wants to stop shrinking before it happens, or limit the damage after it has. It is general information: we have not tested these methods ourselves, and the care label on your garment always comes first.

Quick answer

• Prevent it: read the care label, wash in cool water on a gentle cycle, dry on low heat or air only, and dry sweaters flat.
• Rescue it: a gentle soak and careful reshaping on a towel can sometimes win back a little room in a washable knit.
• Know the limits: the American Cleaning Institute lists shrinkage from overdrying, and residual shrinkage in knits and wovens, as irreversible conditions. Woolmark says severely felted wool cannot be recovered.

Why clothes shrink in the first place

Shrinkage isn't one single problem. Maytag says fabric type and heat are the two major factors: fabrics such as wool and cotton are more prone to shrinking, and high temperatures in washing or drying raise the chance. The American Cleaning Institute (ACI) says many knits and woven fabrics can shrink when laundered, so allow for it when you buy, and it lists overdrying as a cause of shrinkage. Wool has another vulnerability: ACI advises keeping agitation to a minimum for woollen items, with slow agitation or a soak method, because agitation causes an irreversible change. That change is felting, where the fibres lock together; once wool is badly felted, stretching usually cannot reverse it.

The good news: a few laundry habits can prevent many avoidable surprises.

What to check before you wash

• The care label: wash, dry and ironing symbols, and any "lay flat to dry" instruction.
• The fibre: wool and cotton are the most shrink-prone of the common ones, and wool can felt.
• Your settings: cool water, a delicate cycle, low heat or air only.
• Whether the item can be dried flat, and where you will lay it.

How to keep clothes from shrinking

1. Read the care label first. "Dry clean only," "hand wash" and "lay flat to dry" are not interchangeable suggestions. ACI and Maytag both start with sorting clothes by their care labels. If a tag is missing, Maytag suggests a cold, delicate wash and low or no heat in the dryer.
2. Choose cool water when the label allows. Maytag recommends a cold wash and a delicate cycle, which has a lower spin speed that stretches fabric less.
3. Go gentle on wool and delicate knits. Keep agitation to a minimum (ACI). A mesh laundry bag can help protect small items from snagging; that tip is general advice, not from the sources we read.
4. Avoid high dryer heat and overdrying. Maytag says low or no heat is the best way to prevent shrinking, with air drying as the alternative. ACI says to reduce drying time and remove knits, especially cotton ones, while they are still slightly damp, then stretch them back into shape and lay them flat to finish.
5. Dry sweaters flat. Woolmark says to dry wool sweaters flat on a pale, lint-free towel, out of direct sunlight, unless the care label says tumble drying is allowed. Hanging or line drying can stretch knitwear because of the weight of the water, and a radiator can damage the part of the garment that is folded over it.

The simplest rule: if you would be upset to lose the fit, check the label before putting it in the dryer.

How to unshrink a sweater or shirt: a gentle rescue method

This method is for mildly shrunken, washable knits, not severely felted wool or damaged fabric. It adapts the manufacturer instructions below, so it is not a guarantee. Test a hidden area first if dye transfer is a concern.

1. Check the label and inspect the fabric. If the sweater feels unusually thick, stiff and matted, it may be felted. Don't force it. For dry-clean-only or valuable pieces, ask a professional cleaner.
2. Soak gently. Fjällräven's wool care page says to soak a shrunken wool garment for 20 to 60 minutes in room-temperature water with a liquid sweater wash, then drain without rinsing. For washable cotton, plain cool water is a reasonable starting point, but that part is our adaptation.
3. Lift, don't wring. Lay the garment on a towel and roll the towel like a wrap to squeeze out water (Fjällräven). Do not wring it.
4. Reshape on a flat surface. Fjällräven says to lay the garment flat on a ventilated surface such as a mesh sweater rack, gently stretch out the sleeves and body, and pin it in place. After about an hour, check and reshape it again if needed. Compare it with a similar well-fitting garment if you have one.
5. Let it air-dry flat, and repeat if needed. Fjällräven says you can repeat the whole process, as long as the garment dries fully in between. Avoid a hot dryer, a radiator or hanging the wet knit by its shoulders.

For a lumpy shoulder or a stretched-out area on a wool sweater, Woolmark says to dip just that area in warm water (30 to 40 degrees C) and massage it gently by hand; the sweater normally returns to shape after drying. It adds that a sweater labelled dry clean only or hand wash only that was machine washed and severely felted cannot be recovered.

What about baby shampoo or hair conditioner? You may see these recommended as miracle "unshrinking" solutions. We did not find them in the sources we read, and they are not a guaranteed reversal of fibre shrinkage. Residues or additives may be unsuitable for some garments. A fabric-appropriate wash and careful reshaping are the better first steps.

What works for different fabrics?

The rows marked "general advice" are not from the five sources we read.

Three mistakes that make things worse

Pulling hard on a wet sweater: you might lengthen the sleeves while leaving the chest too narrow. Work gradually and evenly.

Trying the dryer again to "reset" it: more heat can deepen the problem. Maytag and ACI both tie heat and overdrying to shrinkage.

Treating every fabric like cotton: wool felting, cotton shrinkage and heat damage to synthetic blends are different problems, so one internet hack cannot solve them all.

Can you really get the original size back?

Sometimes you can recover a little room and make a garment wearable again. But there is no reliable way to promise a full size, or even a particular number of inches, back. The best result depends on the fibre, the knit structure, how much it shrank and whether the change is reversible.

What we could not confirm

• The sources do not give a recovery percentage, and we do not claim one.
• ACI's laundry basics page is an overview, so we use it only for sorting by care label; the shrinkage details come from its laundering problems page.
• Maytag is a washer and dryer maker, so treat its advice as manufacturer guidance.
• The cashmere, polyester and rayon rows, the mesh bag tip and the cotton rescue step are general advice, not quotes from a source.
• We have not tested these methods, and this is not professional garment-care advice.

Related guides

• Understanding fabric labels when shopping online
• The Ultimate Stain Removal Handbook
• How to read clothing size charts online

Last checked: 23 October 2026. Sources: American Cleaning Institute, Laundering Problems & Solutions (no date shown); American Cleaning Institute, Laundry Basics (updated 10 March 2026); Woolmark, How to dry a wool sweater (no date shown); Fjällräven, How do I care for my wool garments? (no date shown); Maytag, How to Help Prevent Shrinking Clothes in Your Laundry (no date shown). The article draft and illustration were supplied by the site owner; we checked each claim against these pages.