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Hey y’all, in keeping with this month’s theme of what’s underneath? today we’re going to talk about types of elastic. Being confronted with a wall of elastic or hundreds of online choices can be intimidating for a beginner, so today’s post is meant to demystify those choices.
Types of Elastic
There are three basic types of elastic: braided, woven and knitted. These refer to how the yarns are put together, and the different methods of construction give the resulting elastics different properties.
Braided Elastic
Elastic braided tape has lengthwise, parallel ridges. Those ridges make this elastic have more grip but they also mean that braided elastic tends to narrow as it is stretched. Braided elastic also rolls more easily than woven or knitted elastics, and tends to lose stretch if it is sewn through. For this reason braided elastic rope is typically recommended for use in casings, not for sewing directly to fabric. But in some casings (like waists) braided elastic isn’t the best choice because of its tendency toward rolling. It’s better in sleeves, necklines, or other areas where rolling isn’t a big issue.
Knitted Elastic
Knitted elastic tape is made by knitting the fibers together. Knitted elastic tends to be softer than braided or woven elastic, and it retains its width when stretched. It also works well even when pierced by needles, so it’s a good choice for sew on applications. It rolls more than woven elastic, but less than braided elastic. Since this elastic is softer, it’s suitable for light to midweight fabrics, but doesn’t have the grip needed for heavier fabrics. With knit elastic, I may cut the elastic slightly shorter than the finished measurement in order to have it grip properly, particularly when I use it for waistbands or bra bands.
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