How to Unshrink an Alpaca Jumper: A Step-by-Step Guide

We've all been there — you pull your favourite alpaca jumper out of the wash, and it's somehow shrunk down to fit a toddler.

Just last month, a rather panicked husband rushed into one of our stores searching for a replacement before his wife returned home. He had accidentally gathered up her beautiful new alpaca sweater with the regular washing, and it came out several sizes smaller than when it went in! Needless to say, he was very keen to replace it before she noticed.

Before you resign your shrunk sweater to the donation pile (or your smallest niece), take a breath. In some cases, a shrunken alpaca garment can be coaxed back into shape at home, with nothing more exotic than hair conditioner and a bit of patience.

Here's everything we know about why alpaca shrinks, whether yours can be saved, and exactly how to bring it back to size.

Why Does Alpaca Shrink in the First Place?

Alpaca fibre, like sheep's wool, is covered in microscopic overlapping scales. When those scales are exposed to heat, moisture and agitation all at once — think a hot wash cycle or a tumble dryer — they open up and interlock with neighbouring fibres. This is called felting, and it's what causes a garment to shrink, thicken and lose its original drape.

Interestingly, alpaca's scales are smoother and less pronounced than sheep's wool, which is part of why alpaca feels so silky against the skin. But don't let that fool you into thinking alpaca is shrink-proof — some fibre studies have actually found alpaca can felt just as readily, or even more so, than wool under the wrong conditions. The takeaway: alpaca still needs to be treated gently, every time.

Can You Actually Unshrink It?

This is the important question to ask before you start. Give your jumper a gentle stretch test:

• If the fibres give a little and you can see individual stitches — good news, it likely hasn't felted, and the steps below may help restore it.
• If the fabric feels dense, matted or fused, with the stitch definition gone — it's fully felted, and unfortunately no amount of soaking or stretching will reverse that. At that point, felted alpaca can still have a second life as a cushion cover or craft project, just not as the jumper it once was.

What You'll Need

• A clean sink, basin or bucket
• Lukewarm water
• Hair conditioner, baby shampoo, or a gentle wool wash
• A clean, absorbent towel
• A flat surface to dry on (a towel-covered table, drying rack, or corkboard with T-pins for stubborn cases)

Step-by-Step: Unshrinking Your Alpaca Jumper

1.  Prepare a gentle soaking solution
Fill your sink or basin with lukewarm water — never hot, as heat is exactly what caused the shrinking. Add one to two tablespoons of hair conditioner, baby shampoo, or a wool-specific wash. These products coat the fibres and help them relax and slide past one another more easily.

2. Soak the jumper
Submerge the garment fully and leave it to soak for 20 minutes to a few hours, depending on how much it's shrunk. For a mild shrink, 20–30 minutes is usually enough. For something more drastic, an hour or two (or even an overnight soak) gives the fibres more time to loosen.

3. Drain, don't rinse
Let the water out of the sink, but leave the conditioner in the fibres for now — it's doing the work of keeping them pliable while you reshape the garment. Gently press out the excess water with your hands. Never wring or twist, as this can distort the knit and stretch it unevenly.

4. Roll it in a towel
Lay the jumper flat on a clean, dry towel, then roll the towel up with the jumper inside, like a scroll. Press gently to draw out more moisture. The garment should end up damp, not dripping.

5. Stretch it back into shape
Unroll the jumper onto a flat surface and gently ease it back towards its original measurements, working evenly from the centre outward. If you have the original dimensions written down (or a similar unshrunk piece to measure against), use that as your guide.

For a jumper that's only slightly shrunk, hand-stretching and laying it flat to dry is usually enough. For more significant shrinkage, pin the damp garment to a corkboard or foam board with stainless steel T-pins, stretched out to size, and leave it to dry completely — this can take a full day or more. Once dry, unpin, then repeat the stretch-and-pin process once or twice more if needed, allowing the garment to dry fully between rounds.

6. Air dry flat, away from heat
Whichever method you use, always let alpaca dry flat and out of direct sun or heaters. Hanging it while wet will pull the knit out of shape, and direct heat risks undoing all your careful work.

A Few Tips for the Best Results

• Patience beats force. Alpaca fibres respond best to gradual, gentle stretching over several sessions rather than one aggressive pull.
• Test your conditioner or wash on an inconspicuous spot first, particularly on pale or naturally undyed alpaca, to make sure there's no colour transfer.
• A final rinse is optional. Many people leave a small amount of conditioner in, as it leaves the fibres feeling soft. If you'd prefer it fully rinsed, a cool, gentle rinse once the garment is back to size is fine.
• Don't expect miracles from a fully felted garment. If the stitches have disappeared into a solid mat, reshaping won't bring them back — prevention really is the best cure here.

Washing Alpaca the Right Way (So You Don't Need This Guide Again)

The best fix for a shrunken alpaca jumper is not needing one in the first place. A few simple habits go a long way:

• Hand wash in cool or lukewarm water with a gentle wool wash, or use your machine's wool/delicates cycle inside a mesh bag if the care label allows it.
• Never use hot water, and skip the fabric agitation of a regular wash cycle.
• Always dry flat, never in the dryer, and keep alpaca out of direct sun while drying.
• Store folded rather than on a hanger, to help your jumper keep its shape season after season.

FAQs

Does alpaca felt as easily as wool?
Alpaca's scales are smoother than sheep's wool, but that doesn't make it shrink-resistant — hot water and agitation can still felt alpaca fibres, sometimes just as easily as wool.

How long does it take to unshrink an alpaca jumper?
A mild shrink can often be fixed in an afternoon. More significant shrinkage may need several stretch-and-dry cycles over a few days.

Can I put my alpaca jumper in the dryer to help it stretch?
No — heat is what caused the shrinking, and more heat will only make it worse. Always reshape and dry alpaca at room temperature, away from direct heat.

Keep Your Alpaca Looking Its Best

A shrunken jumper doesn't have to be the end of the story — with a gentle soak, a little stretching and some patience, alpaca garments can sometimes be coaxed back to their original shape. And if you're after a new piece to add to your wardrobe, explore our range of women's and men's alpaca knitwear — beautifully soft, naturally warm, and made to be loved for years.