Interfacing explained: what it is and how to fuse it
Interfacing is a hidden layer that gives collars, waistbands, button stands and bags their shape. Choose one a little lighter than your fabric and fuse it with pressure, not sliding.
Pinny's tip
Always fuse a test square first. If you can see a bubbly or stiff patch from the right side, go lighter.
Always fuse a test square first. If you can see a bubbly or stiff patch from the right side, go lighter.
What you'll need
- Fusible interfacing: light, medium or heavy to suit your fabric.
- Pressing cloth: keeps glue off your iron.
- Iron: on the setting the interfacing maker gives.
Step by step
- Pick the weight: as a rule, the same as or lighter than your fabric. Knits need stretch interfacing.
- Cut the interfacing using the pattern piece. Some patterns trim it slightly smaller to reduce bulk in the seams.
- Lay the fabric wrong side up and the interfacing on top, glue side (rough or shiny dots) down.
- Cover with a pressing cloth. Press with an up-and-down motion, holding each spot for the time the maker gives (often around 10 seconds), with some steam if recommended.
- Let it cool flat before you move it, so the glue sets.
- Check the edges are stuck. If not, press again.
Watch
INTERFACING! Stop GUESSING and let's talk where, when and HOW to use it! (15:41)
By Evelyn Wood · Open on YouTube
Chosen from its title and channel: a 15-minute video from Evelyn Wood on the same topic as this guide. Embedded from YouTube with credit; we don't host it. It only loads when you press play.
Fusible or sew-in?
| Type | Good for | Watch out |
|---|---|---|
| Fusible woven | Shirts, structured collars | Prewash if the maker advises |
| Fusible non-woven | Bags, crafts, cheap and easy | Can look stiff in clothes |
| Fusible knit / stretch | Jersey, soft garments | Moves with the fabric |
| Sew-in | Sheers, fabrics that cannot take heat | Baste it on before sewing |
Watch it done
- INTERFACING! Stop GUESSING and let’s talk where, when and HOW to use it! by Evelyn Wood on YouTube. Opens on YouTube; the video belongs to its creator.
Sources
All checked November 1, 2026. We read these; we did not test the products ourselves.