Bias tape is a flexible strip of fabric cut on the diagonal grain of the fabric, allowing it to stretch smoothly around curves and edges. It is commonly used for binding seams, finishing raw edges, sewing necklines, making piping, and creating decorative trims in sewing projects. Bias tape can be purchased pre-made or sewn from fabric at home in a wide range of widths, colors, and styles. Because of its flexibility and versatility, bias tape is one of the most useful sewing notions for garment sewing, quilting, and home decor projects. This tutorial will discuss what is bias tape as well as the different types of bias tape.

What is Bias Tape?

Bias tape is simply long strips of fabric, joined together and pressed so that the raw edges meet in the middle. The value of bias tape is the fact that it is stretchy and flexible. The strips of fabric used for this tape are cut on the bias or diagonal of the fabric, thus producing the stretch. 

Bias tape is a flexible fabric strip cut on the diagonal grain and used for binding edges, seams, necklines, and decorative sewing finishes.

• Cut on the fabric bias
• Flexible and stretchy
• Available in single or double fold
• Used for edging and binding
• Can be store-bought or handmade

Learn step-by-step techniques in the full guide to sewing bias tape.

Why Bias Tape Stretches

Bias tape stretches because it is cut diagonally across the grain of the woven fabric rather than parallel to the selvage. Cutting fabric on the bias allows the fibers to shift slightly, creating flexibility that helps the tape curve smoothly around rounded edges and corners.

Types of Bias Tape

The strips of fabric used to make bias tape vary in width and length depending on the project you are cutting them for. Bias tape comes in two main varieties – single fold and double-fold. Read more about types of bias tape.

Here you can see single fold vs double fold bias tape.

Single Fold Bias Tape

Single fold tape is cut on the bias and folded in half once to give a single fold. The raw edges face one another and meet in the middle as the bias strip is folded and pressed. Single fold bias tape is commonly used for facings, armholes, and necklines in clothing.

The most commonly used width is 1/2 inch (12mm) which is used for finishing necklines and armholes. You can choose to sew the bias tape so it is hidden on the inside of the garment or on the outside for an attractive contrast look.

FURTHER READING: How to Sew Single Fold Bias Tape

Double Fold Bias Tape

Double fold bias tape is folded twice and the raw edges are encased in the tape when both folds are complete. The first fold presses the edges towards the center, and the second fold folds the tape in half. Double-sided tapes are slightly wider on one side ensuring you catch in both sides when you are sewing. Once again the most commonly used size is 1/2 inch (12mm). Narrower 1/4 inch (6mm) double-fold bias tape is often used for bias bound seams.

FURTHER READING: Sew Double Bias Tape

Continuous Bias Tape

Continuous bias tape – a challenge? Yes, but with practice, this type of tape is most rewarding to work with and provides beautiful continuity. Continuous bias tape has less piecing and is created by sewing your fabric into a tube and then cutting in a spiral to create a continuous strip of fabric. You can then press it into either single or double-fold bias tape to suit your project.

What is Bias Tape Used For?

Bias tape has many uses. Practical, decorative, and providing comfortable seam finishes are all possible with bias tape.

Here are some suggestions for using bias tape, especially the self-made variety, because it is unique and can be tailor-made to suit your needs.

1. Binding Edges – Bias tape is perfect for neatening the edges of all sorts of projects. It makes a neat and strong finish. The long and hard work of making a quilt is perfectly finished with bias tape. Decorative blinds, cushion covers, and other home décor items benefit from some self-made or store-bought bias tape to finish off edges.
2. Seam Finishes – Bulky seams or the seams that are visible inside jackets always look neater with a bound seam. The Hong Kong seam finish uses bias tape to finish off each side of the seam neatly.
3. Draw Strings and Ties – Bias tape makes good strings for something needing to be pulled together and tied. A stitched drawstring of self-made bias tape glides beautifully through a casing and ties at the front of a pair of drawstring trousers.
4. Button Hole Loops – Bias cut loops stitched together to make the loops for buttons fastened on a beautiful gown make an elegant finishing touch. Bridal gowns with this kind of feature look really stylish. 
5. Decor and Trims – Use the bias cut tape to decorate cushions with diagonal stripes or a colorful trim. Mix and match different colors in the upholstery palette and turn cushions into a really interesting array of colors while neatening them at the same time.
6. Piping – Using self-made bias as a casing for piping cord or just as a way to trim the edges of a cushion is another way of incorporating bias tape into your sewing. Bias tape brings out the different textures and colors in the fabric.
   • How to Make Piping
   • Sewing Piping
   • Cushion Cover with Piping

How Bias Tape is Made

Bias tape is made by cutting fabric strips diagonally across the fabric grain at a 45-degree angle. The strips are joined together, then pressed into either single-fold or double-fold tape. Because bias-cut fabric stretches more easily than straight-grain fabric, bias tape can curve smoothly around necklines, armholes, and rounded edges.

There are 3 main steps to making bias tape

1. Cut bias strips on the diagonal
2. Join the strips
3. Press the bias strips into single or double fold bias.

Read the full tutorial on how to make bias tape for detailed cutting and pressing instructions.

Best Fabrics for Bias Tape

Lightweight woven cotton fabrics are the most common choice for bias tape because they press easily and curve smoothly. Quilting cotton, lawn, voile, and lightweight linen all work well for homemade bias tape. Avoid thick bulky fabrics unless making piping or heavy decorative trims.

Store-Bought vs Homemade Bias Tape

Store-bought bias tape is convenient and available in many standard colors and widths, while homemade bias tape allows complete control over fabric choice, print, and width. Homemade bias tape is especially useful when matching garment fabrics or creating custom decorative trims.

Common Bias Tape Mistakes and Tips

Bias tape can become twisted, stretched, or uneven if it is not pressed carefully before sewing. Using plenty of pins or clips and sewing slowly around curves will help create smoother more professional-looking finishes.

Common Mistake	Tip
Twisted tape	Press tape before sewing
Wavy edges	Avoid stretching bias tape
Uneven binding	Pin carefully before stitching
Bulky corners	Trim seam allowances
Missed back edge	Make underside slightly wider

What is Bias Tape FAQs

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What is Bias Tape – In Conclusion

Bias tape is one of the most versatile sewing notions for binding edges, finishing seams, sewing curves, and creating decorative trims. Because it is cut on the fabric bias, the tape stretches smoothly around necklines, armholes, corners, and curved sewing projects. Whether you choose store-bought or homemade bias tape, learning how to use bias binding can greatly improve the finish and durability of your sewing projects.