How to Unshrink a Sweater (and When It Can't Be Saved)

You know the moment. You pull your favorite sweater out of the dryer and it's the same color, with the same buttons and the same little mark on the cuff. It's just two sizes smaller. Possibly three.

Here's the good news: a lot of shrunken clothes can be at least partly rescued. Here's the honest news: not all of them. It depends on the fiber, how the garment shrank and whether the fibers are just tightened up or permanently damaged.

It takes about 30 minutes of soaking, a little conditioner and some patience. Let's see what we can save.

Why Do Clothes Shrink?

Shrinking comes down to three things: heat, moisture and agitation.

• Cotton fibers get stretched during manufacturing. Hot water and a hot dryer let them relax back to their natural, shorter length.

• Wool has tiny scales on every fiber. Heat and tumbling make those scales lock together, which is called felting. Felting is the sweater equivalent of a permanent decision.

• Synthetics like polyester and acrylic rarely shrink. When they do, it's usually heat damage, and heat damage is permanent.
  

The only clothes you can unshrink are the ones whose fibers have tightened up but not fused. That's why the method below works on some sweaters and not others.

First: Check the Care Label

Before you do anything, read the label for:

• Fiber content
• Washing method
• Water temperature
• Whether it's hand wash only
• Whether it's dry clean only
• Whether it can be tumble dried
• Whether it should be dried flat
  

If the sweater is expensive, vintage, sentimental or "dry clean only," take it to a professional cleaner before you try anything at home. A home rescue attempt that goes wrong is a lot harder to fix.

The Basic Unshrinking Method

This works best on cotton, wool and wool blends that have shrunk a size or so.

Step 1: Fill a Basin With Lukewarm Water

Use lukewarm water, comfortable to the touch, around 85–95°F. Heat helped get us into this situation. It's not going to get us out. Stir in hair conditioner or baby shampoo: about 1 tablespoon per quart of water. That's 2 to 3 tablespoons for a sink full. The conditioner coats and softens the fibers so they'll relax and stretch.

Step 2: Soak the Garment Gently

Step 3: Remove Excess Water. Don't Wring

Step 4: Reshape the Garment

Unroll it onto a second dry towel. Then gently stretch it, a little at a time, working evenly around the:

• Sleeves
• Shoulders
  
• Body
  
• Hem
  
• Width
  

Pull gently in short tugs. Don't try to get it all back in one big yank. Even, gradual stretching keeps one sleeve from ending up longer than the other.

Step 5: Use Another Garment as a Guide

Lay a similar sweater that fits you on top, or use the original measurements if you have them, and stretch to match:

• Shoulder width
• Chest width
  
• Overall length
  
• Sleeve length
  

To hold the shape while it dries, weigh down the edges with books or heavy cans, or pin it to a towel on a carpet or mattress with rustproof pins.

Step 6: Let It Dry Flat

Let the sweater air-dry flat, away from heat and direct sun. Give it a few more gentle stretches every hour or so while it's still damp. Don't hang it.

Gravity is excellent at stretching things, just not evenly. You'll end up with a sweater that reaches your knees but still pinches your armpits. It can take 24 hours or more to dry completely. If it's still a little small, repeat the whole process.

How to Unshrink a Wool Sweater

Wool is the trickiest. If it shrank only a little and still feels soft and stretchy, the conditioner soak above often helps. If it feels thick, stiff and dense, like a felted placemat, the fibers have locked together, and no amount of conditioner will unlock them. Keep your expectations low and your stretching gentle.

For wool, keep everything cool, and skip anything that rubs or agitates.

How to Unshrink Wool → 

How to Unshrink Cotton Clothes

Good news: cotton is usually the most forgiving. T-shirts, cotton sweaters and cotton knits respond well to the same soak-and-stretch method. Check the:

• Width
• Length
  
• Sleeves
  
•  Neckline
  
• Seams
  

Cotton can usually be stretched a bit more firmly than wool. Just watch the seams.

Can You Unshrink Jeans?

Sometimes. Denim that shrank in the dryer will often loosen up as you wear it. To speed things up, spritz the tight spots with water, or put them on damp, then squat, stretch and walk around until they dry. You may look ridiculous. Your jeans may fit again.

Can You Unshrink Polyester?

Usually not. Polyester and acrylic rarely shrink, and when they do, it's because heat melted or set the fibers. The conditioner method won't hurt to try, but don't use heat to stretch them. It'll make things worse.

What About Cashmere?

Cashmere is wool's more delicate, more expensive cousin, so treat it even more gently. The conditioner soak can help with mild shrinking. Badly shrunk or felted cashmere should go to a professional cleaner. Don't experiment with it.

Does Hair Conditioner Really Unshrink Clothes?

It helps. Conditioner softens and lubricates the fibers, so they relax and stretch more easily. It doesn't magically reverse shrinking. The stretching does the real work. Use a basic, inexpensive conditioner, and skip anything heavy, oily or strongly scented.

Does Baby Shampoo Work?

Yes, and the same way: it softens the fibers so you can stretch them. Baby shampoo is a good choice if you're worried about conditioner leaving residue or fragrance behind. Use about the same amount, 1 tablespoon per quart of water.

Can Vinegar Unshrink Clothes?

You'll see vinegar soaks online, especially for wool. I don't recommend vinegar as your first choice. It can affect some dyes, and there's no good evidence it works better than conditioner. If you try it, test it on a hidden seam first.

Can You Just Stretch the Clothing While It's Dry?

Not a good idea. Dry fibers are stiff, and yanking on them can tear seams, distort the knit or leave you with a stretched-out shape. Damp fibers stretch more evenly and more safely.

When Unshrinking Probably Won't Work

Stop and accept the loss if:

• The wool is heavily felted

• The fabric feels scorched, stiff or melted from heat

•  It shrank dramatically. A grown-up's sweater that now fits a toddler isn't coming back.

• The seams or shape are badly twisted

• The stretch fibers, like spandex, are damaged and the fabric has lost its bounce

• Repeated stretching isn't changing the fit

• The fabric starts thinning, pilling or tearing while you work
  

At that point, more stretching just damages it further.

How to Prevent Clothes From Shrinking Again

Read the care label before washing.

Read the care label before the sweater becomes doll clothing.

Use the right water temperature.

Wash sweaters in cold water, on the gentle or wool cycle, or wash them by hand.

What Temperature Should You Wash Clothes? → 

Be careful with dryer heat.

Skip the dryer for sweaters entirely. Dry them flat. The dryer does not recognize urgency as a textile-care category.

Remove clothes when they're dry.

For everything else, use low heat and pull clothes out the minute they're done. Overdrying is when the most shrinking happens.

Treat delicate knits differently.

Wash wool, cashmere and fine knits separately, in a mesh bag or by hand. Your closet contains more complicated citizens than T-shirts.

How to Wash Sweaters →

The “I Just Shrunk It” Rescue Checklist

1.     Check the fiber content and the care label.

2.     Decide whether it's just tight or truly felted, scorched or damaged.

3.     Fill a basin with lukewarm water and 1 tablespoon of conditioner or baby shampoo per quart.

4.     Soak it gently for 30 minutes.

5.     Press out the water. Don't wring.

6.     Roll it in a towel.

7.     Stretch it gradually, using a sweater that fits as your guide.

8.     Keep the shape even on both sides.

9.     Dry it flat, away from heat.

10.  Stop if stretching starts damaging the fabric.

What If It Still Doesn't Fit?

Some sweaters can't be saved, and that's OK. Pass it to a smaller friend or family member, donate it, or turn it into something new, like pillow covers, mittens, a pet sweater (Bruiser approves) or felted craft projects. Then figure out what shrank it, so it doesn't happen to the next one.

Unshrinking FAQ

Can you really unshrink a sweater? Often, yes, partly. Cotton and lightly shrunk wool usually come back about a size with a conditioner soak and gentle stretching. Heavily felted wool usually can't be saved.

How much conditioner do you use to unshrink clothes? About 1 tablespoon of hair conditioner or baby shampoo per quart of lukewarm water. That's 2 to 3 tablespoons for a full sink.

How long should you soak a shrunken sweater? About 30 minutes.

Should you rinse out the conditioner? Usually not. A little conditioner left in the fibers helps them stretch. If the fabric feels slimy, give it one quick lukewarm rinse.

Can you unshrink clothes in the dryer? No. Heat is what shrank it. Always dry an unshrunk sweater flat.

Want Laundry That Doesn't Ruin Your Favorite Clothes?

My book The Daily Home Reset builds laundry into a 15-minute daily routine, with no more rushing and no more "I'll just toss it in the dryer."

And if your closet is so packed you can't find the sweaters you do still fit into, Room by Room: How to Declutter a Lifetime of Stuff and Get Your Space Back will help you decide what stays.

Keep Going

Keep your clothes looking good, and the right size, with these related guides:

•      Laundry & Stain Removal Guide: How to Wash Clothes: Everything from sorting to stains, all in one place.

•      How to Wash Sweaters: Wash wool, cashmere and cotton knits without shrinking them.

•      How to Machine Wash Sweaters: When it's safe to put a sweater in the washer, and how to do it right.

•      How to Unshrink Wool: More tips for rescuing a shrunken wool sweater.

•      What Temperature to Wash Clothes: Cold, Warm or Hot Water?: A simple guide to choosing the right water temperature.

•      Luxury Clothes Care Tips: How to care for your nicest, most expensive pieces.

•      How to Wash Dark Clothes Without Fading: Keep your blacks black and your navies navy.

•      Laundry Stain Removal Guide: Step-by-step fixes for the most common stains.