Tips

You pulled your favourite wool cardigan out of the wash and it's half the size it used to be. Before you resign it to the bin — or your younger sibling — there's good news: in most cases, a shrunken wool cardigan can be rescued. Here's exactly how to do it.

First: Can Your Cardigan Actually Be Unshrunk?

Not every shrunken woolly can be saved — but many can. It depends on two things: how the wool has reacted to the wash, and how severely it has shrunk.

Shrinking vs. Felting — Know the Difference

Shrinking happens when heat and moisture cause wool fibres to tighten — this can often be reversed. Felting is different: it's when fibres lock together permanently into a dense, matted texture. If your cardigan looks fuzzy and matted with no visible knit stitches, it has likely felted and cannot be restored.

Run your fingers across the fabric. If you can still see individual knit stitches and the fabric has some stretch, you're in a good position to try. If it feels stiff and board-like, the damage may be permanent.

⚠ When to stop before you start: If your cardigan has gone from adult to child-sized, or if the fibres feel completely locked together with no give, it's likely beyond rescue. The method below works best on cardigans that have shrunk by half a size to one full size.

What You'll Need

You don't need anything special — most of these are already in your bathroom or kitchen.

• A clean bucket or basin (large enough to fully submerge the cardigan)
• Lukewarm water — not hot
• 2 tablespoons of hair conditioner, baby shampoo, or liquid fabric softener
• Two clean dry towels
• A flat surface to dry on (a drying rack or clean floor)
• T-pins or safety pins (optional, but recommended)

Pro tip: Hair conditioner works particularly well because it softens the wool fibres and restores their natural elasticity. Avoid anything with bleach or strong fragrance.

How to Unshrink a Wool Cardigan — Step by Step

Take your time with this. The process takes about 30–40 minutes of active work, plus drying time overnight.

Step 1 — Fill the basin with lukewarm water

Temperature matters. Water that is too hot will shrink the fibres further. Aim for lukewarm — comfortable to the touch, not warm. Add two tablespoons of hair conditioner or baby shampoo and stir gently until dissolved.

Step 2 — Submerge the cardigan and soak for 30 minutes

Place the cardigan in the water and gently press it down until fully submerged. Leave it to soak for a minimum of 30 minutes — up to two hours for more severe shrinkage. The conditioner works to soften and relax the fibres during this time.

Step 3 — Remove, do not rinse, do not wring

Carefully lift the cardigan out of the water. Do not rinse out the conditioner — it needs to stay in the fibres to keep them pliable. Do not wring or twist the garment. Gently squeeze excess water out with your hands.

Step 4 — Roll in a towel to remove moisture

Lay the cardigan flat on a dry towel and roll them both up together, pressing gently as you go. This draws out excess water without stressing the fibres. Unroll, then transfer the cardigan to a second dry towel.

Step 5 — Gently stretch the cardigan back to shape

With the cardigan flat on the towel, use your hands to carefully stretch it back toward its original dimensions. Work slowly — stretch the body, sleeves, shoulders, and hem a little at a time. Don't force it. The fibres should feel pliable and responsive.

Step 6 — Pin and leave to dry flat

If you have T-pins or safety pins, pin the edges of the cardigan to a towel or foam board at the correct dimensions. This stops it from shrinking back as it dries. Leave it in a well-ventilated area away from direct sunlight or heat sources. Allow to dry fully — this can take 12–24 hours.

Still not quite right? If one round doesn't fully restore it, repeat the process. Some cardigans need two or three rounds of soaking and stretching before they return to their original size. Patience is everything here.

How to Prevent Your Wool Cardigan From Shrinking Again

Once you've put in the work to rescue your cardigan, you'll want to make sure it never happens again. Wool care is simple once you know the rules.

The Three Causes of Wool Shrinkage

Wool fibres shrink when they're exposed to the wrong combination of heat, moisture, and agitation. A standard washing machine cycle combines all three — which is why machine-washing is the most common culprit.

• Always check the care label before washing — many wool cardigans are hand-wash or dry-clean only
• If machine washing, use a wool or delicates cycle with cold water only
• Never tumble dry wool — the heat and tumbling will shrink it every time
• Never hang a wet wool cardigan — the weight of the water will stretch it out of shape
• Always dry flat on a clean towel in a well-ventilated area, away from direct heat or sunlight
• Hand wash in cool water with a specialist wool detergent for best results

When It's Time to Let Go — And Upgrade

Sometimes, despite your best efforts, a cardigan is genuinely beyond saving. If the fibres have fully felted, or it has shrunk too severely to restore, it may be time to invest in a replacement — and this time, one built to last.