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.

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

1. Pick the weight: as a rule, the same as or lighter than your fabric. Knits need stretch interfacing.
2. Cut the interfacing using the pattern piece. Some patterns trim it slightly smaller to reduce bulk in the seams.
3. Lay the fabric wrong side up and the interfacing on top, glue side (rough or shiny dots) down.
4. 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.
5. Let it cool flat before you move it, so the glue sets.
6. Check the edges are stuck. If not, press again.

Fusible or sew-in?

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 1 November 2026. We read these; we did not test the products ourselves.

1. The Sewing Studio: interfacing help
2. The Sewing Directory: guide to Vlieseline
3. Vlieseline: products
4. YouTube: INTERFACING! Stop GUESSING and let's talk where, when and HOW to use it! (Evelyn Wood)