How to Shrink a Cashmere Sweater
Why You Might Want to Shrink Cashmere
Sometimes a cashmere sweater is too large. Maybe it stretched out from wear, you bought the wrong size online, or a sweater was a gift that does not quite fit. Intentional shrinkage is possible — but it comes with real risks that you need to understand before trying.
The same properties that make accidental shrinkage a nightmare — cashmere's sensitivity to heat and agitation — are what you will use deliberately here. The process is controllable but not precise. You cannot shrink cashmere by exactly one size the way you can tailor a garment.
Important Warnings
- This process is not fully reversible. If the sweater shrinks more than intended, the unshrinking method may recover some of it, but there are no guarantees.
- Do not attempt on expensive or sentimental cashmere. A tailor can take in seams and shorten hems with precise control and no fiber damage. Intentional shrinkage is a budget alternative, not a precision tool.
- The texture may change. Some felting is likely to occur during the process. The cashmere will feel slightly denser and less soft than before.
The Controlled Warm Water Method
What You Need
- A basin or sink
- Warm water — 40°C to 50°C (104°F to 122°F), not hot
- Cashmere detergent
- Towels for drying
Step by Step
- Fill the basin with warm water. The temperature should be warm but not hot. You should be able to hold your hand in it comfortably. Add a small amount of cashmere detergent.
- Submerge the sweater. Press it into the water gently. Do not agitate — you want heat-based shrinkage, not felting from friction.
- Soak for 10-15 minutes. Check the sweater's size every 5 minutes by lifting it out and holding it up (supported from underneath). Cashmere shrinks gradually in warm water, so you can control the degree somewhat by monitoring the progress.
- Remove when satisfied. When the sweater appears to have shrunk to approximately the right size — keeping in mind it may shrink slightly more as it dries.
- Rinse in cold water. This stops the shrinkage process. Submerge in cold water for a minute, then lift out.
- Press dry and reshape. Roll in a towel to remove excess water. Lay flat and shape to the desired dimensions. Pin if necessary to hold the shape while drying.
How Much Shrinkage to Expect
| Water Temperature | Soak Time | Expected Shrinkage | Felting Risk |
|---|---|---|---|
| 40°C (104°F) | 10 min | 5-8% | Low |
| 40°C (104°F) | 20 min | 8-12% | Low to moderate |
| 50°C (122°F) | 10 min | 10-15% | Moderate |
| 50°C (122°F) | 20 min | 15-25% | High |
Start with the mildest combination (40°C, 10 minutes). You can always repeat the process for more shrinkage, but you cannot undo excessive shrinkage easily.
The Dryer Method (Higher Risk)
Tumble drying on low heat for 5-10 minutes causes rapid, uniform shrinkage. This is faster than the soak method but much harder to control. The heat plus mechanical tumbling triggers both shrinkage and felting simultaneously.
If you try this method: Set the dryer to the lowest heat. Check every 2-3 minutes. Remove the moment the sweater reaches the desired size. Be prepared for some texture change — the tumbling creates felting that the soak method largely avoids.
This is the highest-risk approach. Use it only on inexpensive cashmere that you are comfortable potentially ruining.
Better Alternatives
Before shrinking, consider these options:
- Tailoring: A tailor can take in side seams, shorten the body or sleeves, and adjust the fit with precision. Cost: $20-50 depending on the alterations. No fiber damage.
- Layering: An oversized cashmere sweater works well as a layering piece over fitted base layers. The relaxed fit may be intentional by design.
- Exchange or return: If the sweater is new and the wrong size, exchanging is always better than altering.