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What is Bias Tape?

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  • Written By: Devon Pryor
  • Edited By: O. Wallace
  • Last Modified Date: 07 November 2016
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Bias tape, also known as bias binding, is made from strips of fabric which are used as edging in a variety of sewing projects, including the making of clothing and quilting work. Bias tape is, as the name implies, a long strip of fabric cut on the bias. The bias of a fabric is also known as the cross-grain, and refers to a cut made at a 45° angle to the threads of the fabric. Basic fabrics are made by weaving threads together at 90° angles. Thus by cutting along a 45° angle, the cut is made directly across, rather than along, the lines of the woven threads.

Bias makes an appropriate edging in sewing by adding flexibility and support to the edge of the fabric, and preventing fraying. Cutting along the bias allows the woven threads to share the tension of pulling or stretching fabrics, rather than letting either the horizontal or vertical threads absorb all the tension on their own.

Due to its flexibility and finished look, bias tape is often used in place of a hem at the edge of a piece of fabric. Bias tape can be used directly on raw edges of fabric, or can be used to make other types of edging, including piping and binding seams. Bias tape is commonly used in armholes, necklines, straps, or ties in both clothing and bags.

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Bias tape is available for purchase in sewing and craft stores, but it is only offered in a select variety of colors. For this reason, many seamstresses and craftspeople elect to make their own bias tape. This can be easily accomplished by cutting the desired fabric along the cross-grain to make a long strip. The strip of fabric can be folded and either pressed, or sewn to finish the edge of the bias tape itself, to make it appear more attractive.

Simple bias tape is little more than a strip of bias-cut fabric, whereas single-fold and double fold bias tapes are more complicated, and can perhaps provide more structural support to a garment. Single-fold bias tape is made by folding the strip of fabric in half lengthwise, with wrong sides together, and pressing the fabric to form a distinct edge. Double-fold bias tape is made simply by folding a single-folded bias tape in half again.

It is important to cut a fabric strip wide enough that it will still serve as an edging once it has been folded to make the bias tape. The length is also important to consider when cutting the fabric strip. If the strip is not long enough, two strips may have to be sewn together at the ends, perhaps compromising both the strength and the appearance of the bias tape. When executed correctly, the use of bias tape can lend both support and decorative detail to a garment, and prevent the warping of a curved edge of fabric that might occur with a straight grain strip of fabric, or a simple hem.

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Lostnfound
Post 2

My friend's mom uses bias tape in quilting a lot. I'm not sure exactly how she uses it, but she keeps a lot of it around. Maybe she uses it as some kind of border or separation for the quilt squares. I don't know. I know she uses quite a bit of it, though, and she makes her own, as well as buying it at the fabric store.

Grivusangel
Post 1

Binding off an armhole, especially, with bias tape is one of the better ways to keep the edges from stretching and/or fraying. It also makes a sleeveless garment more comfortable to wear.

Most people I know who sew a lot usually keep an assortment of bias tape in their sewing boxes. It's also good for binding princess seams inside a garment, also so they will be more comfortable for the wearer.

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