How Much Do Fabrics Shrink (and Should You Pre-Wash Them?)

If you’ve ever sewn something you absolutely loved… only for it to come out of the wash a little tighter, shorter, or just not quite right — you are definitely not alone.

This is one of the questions I get asked all the time:

“Do I really need to pre-wash my fabric?”

Short answer? ✨ Usually, yes. ✨

Long answer? Let’s dive in — because once you understand why fabric shrinks, everything suddenly makes a lot more sense.

✨ So… why does fabric shrink?

Most shrinkage comes down to what’s happening at a tiny, fibre level.

Natural fibres like cotton, linen and viscose are made from plant-based cellulose. During manufacturing, these fibres are:

• stretched

• spun

• woven under tension

This leaves them holding a bit of stored stress (think of it like a stretched elastic band).

When you add water and heat, the fibres relax and return closer to their natural state — and that’s what we see as shrinkage.

✨ A simple way to picture it:

The fabric has basically been “pulled tight” in production… and washing lets it exhale.

🧵 How much do different fabrics shrink?

Here’s a helpful guide you can bookmark (or screenshot for later 👀):

Cotton

• Shrinkage: 3–5% (sometimes more on first wash)

• Pre-wash: Yes, always

• Why: Highly absorbent fibres relax significantly in water

Linen

• Shrinkage: 5–10%

• Pre-wash: Definitely yes

• Bonus: It gets softer and more beautiful every wash ✨

Viscose

• Pre-wash: Yes (gently!)

• Note: Can shift or distort if handled roughly

Wool

• Shrinkage: Varies a lot

• Pre-wash: Depends on how you’ll care for it

• Science bit: Heat + agitation can cause fibres to lock together (felting)

Polyester &Synthetics

• Shrinkage: Very little (0–2%)

• Pre-wash: Optional (but still a good idea)

• Why: Fibres are heat-set during production, so they’re already stable

✨ Why knits shrink (slightly different science!)

Woven fabrics shrink mainly because fibres relax…

👉 Knits have an extra factor:

They’re made from loops rather than straight threads.

When washed:

• those loops tighten and draw in

• the fabric can shrink in length more than width

• and it may twist slightly (hello, side seam drama 👀)

✨ So instead of just “exhaling”…

knits also kind of “snuggle in on themselves”

🧺 Should you pre-wash jersey?

Yes — 100% recommend

Especially if:

• it’s cotton or viscose jersey

• you’re making fitted garments (t-shirts, dresses, leggings)

💛 Best way to pre-wash knits

• Wash at the same temperature you’ll use later

• Avoid overloading the machine (knits need space to move)

• Dry the same way you plan to after sewing

• Let it rest flat before cutting (helps it settle back into shape)

✨ Little tip that makes a big difference

After washing:

• Knits can look a bit… wonky

• Edges might curl

• Grain can shift

👉 Give it a good press with steam before cutting

This helps everything relax and behave properly again

Should you pre-wash your fabric?

Here’s your golden rule:

Wash your fabric the way you plan to wash the finished garment.

💛 You should pre-wash if:

• Your garment will be machine washed

• You’re using natural fibres

• You want to avoid any post-sewing surprises

✨ You might skip it if:

• The fabric is dry clean only

• You need structure (like crisp tailoring)

• The fabric is very delicate

QUICK PRE-WASH GUIDE

Fabric Type	Pre-Wash?	How to Wash	Drying Tip
Cotton	Yes	30–40°C machine wash	Tumble dry or air dry
Linen	Yes	30°C gentle wash	Air dry for best texture
Viscose / Rayon	Yes	Cool, gentle cycle	Air dry flat to prevent distortion
Wool	Maybe	Cool hand wash or wool cycle	Lay flat to dry
Polyester	Optional	30°C machine wash	Air dry or low tumble
Jersey / knits	Yes	30°C gentle wash	Air dry or low tumble (expect some shinkage)

✨ A little sewing wisdom (from experience!)

Pre-washing might feel like an extra step when you’re excited to start sewing… but it’s one of those small things that makes a big difference.

It helps your finished piece:

• keep its shape

• fit the way you intended

• and last longer

And honestly? It gives you that quiet confidence that everything is going to behave exactly as it should.

✨ Final thoughts

Fabric shrinking isn’t random — it’s completely natural, and once you understand the “why”, it stops feeling frustrating and starts feeling manageable.

Think of pre-washing as part of the creative process, not a chore.

A little prep at the beginning means more joy at the end 💛

MAKE THAT FABRIC SPARKLE

If this is something you’ve ever been unsure about, you’re absolutely not alone — and hopefully now it feels a whole lot clearer (and maybe even a little bit satisfying ✨).