How to sew a hidden bias binding | Neckline, sleeve & hem tutorial
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How to sew hidden bias binding | Neckline, sleeve & hem tutorial
Hidden bias binding, sometimes called a bias facing, is a clean way to finish necklines, sleeveless edges and hems without leaving the bias tape visible on the outside of the garment. Once sewn, the binding is turned completely to the wrong side, creating a neat edge with very little bulk.
In this tutorial, you will learn how to attach the bias, join the ends neatly, turn it to the inside and secure it in place. You can finish the binding by machine for a quick, durable result, or sew it by hand if you want to avoid a visible line of stitching on the right side.
Materials needed
- Bias binding suitable for your fabric
- Matching thread
- Fabric scissors
- Pins or sewing clips
- Iron and ironing surface
- Sewing machine
- Fine hand-sewing needle, if finishing by hand
Before you start
Staystitch or handle curved garment edges carefully before attaching the bias, especially around necklines and armholes. These areas can stretch easily because parts of the edge may be cut on or close to the bias grain.
Hidden bias binding vs visible bias binding
With visible bias binding, part of the bias remains visible around the finished edge. With hidden bias binding, the entire strip is turned to the wrong side of the garment. The bias itself disappears from the outside, making this technique especially useful when you want the fabric and garment shape to remain the main visual focus.
Step-by-step instructions
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Prepare the bias binding
Cut a bias strip long enough to go around the edge you are finishing, leaving additional length at both ends so they can be joined neatly. In the technique shown in the video, approximately 20 cm of extra length gives you room to work comfortably.
Open one folded edge of the bias and place the strip right sides together with the garment, aligning the raw edge of the bias with the raw edge of the neckline, sleeve or hem.
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Pin and sew the bias to the garment
Begin pinning several centimetres away from the starting end of the bias, leaving the first section free so you have enough room to join the ends later.
Continue pinning around the edge without stretching the garment. On curved areas, allow the bias to follow the shape naturally rather than pulling it tightly around the curve.
Sew the bias in place along its opened fold line, or use the seam allowance specified by your pattern.
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Join the bias ends
Stop sewing before reaching the starting point so both loose ends remain accessible. Bring the two bias ends together following the joining method shown in the video and mark where they need to meet.
Sew the ends right sides together, trim the excess seam allowance and press the joining seam open. Lay the completed bias back against the garment and finish stitching the remaining gap.
Before continuing, make sure the joined bias lies smoothly around the edge without pulling or creating excess fullness.
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Press the bias away from the garment
Press the bias away from the garment to set the first seam and create a clean edge. Do not skip this pressing step, particularly on curved necklines or armholes.
If necessary, work around curved areas gradually with the tip of the iron so the bias follows the shape without stretching or distorting the main garment fabric.
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Turn the bias completely to the inside
Fold the bias over the raw garment edge and turn the entire binding to the wrong side. The original garment edge should form the finished outer edge, with no bias visible from the right side.
Press carefully so the bias sits flat inside the garment. Avoid allowing the bias to roll toward the right side, as even a small amount can become visible around a neckline or armhole.
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Secure the hidden bias binding
Pin or clip the bias securely on the wrong side of the garment.
For a machine-sewn finish: stitch close to the inner edge of the bias, following the method shown in the video. This creates a visible line of stitching on the right side but gives a strong, practical finish.
For a completely clean exterior: secure the inner edge of the bias by hand with a slip stitch or another discreet hand stitch, taking only a tiny amount of the garment fabric so the stitches remain invisible from the right side.
Professional sewing tip
Press after every major step. On a curved neckline, do not stretch the garment edge while applying the bias. Let the bias follow the curve naturally and shape it gradually with your fingers and iron. This helps prevent a neckline from becoming wavy or standing away from the body.
Choosing bias binding for your fabric
Hidden bias finishing works especially well on lightweight and medium-weight woven fabrics. For delicate fabrics, choose a fine bias that will not create unnecessary bulk. For heavier fabrics, consider the total thickness of the bias and garment before using this finish, particularly around small or tightly curved edges.
Common hidden bias binding problems
The neckline looks wavy
The garment edge may have stretched while the bias was being attached. Avoid pulling the neckline during sewing and handle curved edges as little as possible before they are stabilised.
The bias rolls to the outside
Turn the first seam slightly toward the wrong side when pressing and make sure the entire width of the binding is pulled to the inside before securing it.
The binding puckers around a curve
Do not force a straight section of bias around a curve. Work gradually and allow the bias grain to shape around the edge. Pressing in small sections can help the binding settle smoothly.
The finish feels bulky
The bias may be too heavy or wide for the garment fabric. A lighter bias or narrower finished width can create a cleaner result on delicate fabrics.
The stitching is visible on the outside
Machine stitching the inner edge of the bias will normally create a visible stitching line on the right side. If you want the exterior completely free of visible stitching, secure the inner edge by hand instead.
Related bias binding tutorials
AinaSewingPatterns tutorial
This tutorial is part of the AinaSewingPatterns sewing library, created to help you achieve clean, professional garment finishes using practical techniques you can apply to your own sewing projects.
Want to keep building your sewing skills? Browse all our step-by-step sewing video tutorials.
Ready for your next sewing project? Discover our PDF sewing patterns.
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