Question 1

What's the difference between braided and knit elastic?

Accepted Answer

Braided elastic has visible lengthwise ridges and gets narrower when stretched, so it works best threaded through a casing rather than stitched flat. Knit elastic is softer, stays the same width when stretched, and won't curl, which lets you sew it directly to the fabric. Use braided for sleeve and neckline casings; choose knit for waistbands sewn to soft knits, underwear, and children's clothing where comfort against skin matters.

Question 2

What width of elastic do I need for a waistband?

Accepted Answer

For most adult skirt and pajama waistbands, 3/4" to 1" elastic is the standard. Use 1/4" to 3/8" for sleeve cuffs, baby clothes, and doll outfits; 1/2" for light skirts and children's pants; and 1 1/2" to 2" no-roll woven elastic for heavier trousers and athletic wear that needs to stay flat. Cut the elastic about 1-2" smaller than your relaxed waist measurement for a snug fit.

Question 3

What is fold-over elastic and when do I use it?

Accepted Answer

Fold-over elastic (FOE) has a center crease so it wraps around a raw edge and binds it in a single step. It's the go-to finish for leggings, headbands, baby bibs, bralettes, and cloth diapers. Standard FOE is 5/8" wide and folds to about 5/16". Look for a matte or satin face and good stretch recovery; cheaper FOE can crack or lose its rebound after a few washes.

Question 4

How much elastic should I buy for a project?

Accepted Answer

Buy your cut length plus 10-15% for overlap and seam allowance. A single waistband uses under a yard, but a maker stocking up often wants a bulk spool. Cut packs typically run 3-10 yards; bulk spools come in 25, 50, 100, or 144-yard rolls. Expect about $1-$3 per yard for specialty trims like FOE or picot-edge, and $8-$30 for a standard braided or knit spool.

Question 5

Which elastic works for swimwear and activewear?

Accepted Answer

Use clear (polyurethane) swim elastic or rubber swimwear elastic, both rated for chlorine, salt, and repeated stretching. Clear elastic is thin, strong, and nearly invisible when zigzagged into leg openings and necklines on lycra and spandex. For sports bras and waistbands on athletic fabric, cotton/poly knit or plush-back elastic feels softer against skin. Standard widths for swim and activewear are 3/8" to 3/4".

Question 6

Why is my elastic twisting or rolling in the casing?

Accepted Answer

Rolling usually means the elastic is too narrow for the casing or it's a braided type used where a no-roll style was needed. Switch to woven no-roll elastic, which is stiffer across its width and resists folding, and make the casing only slightly wider than the elastic. Stitching through the elastic at the side seams also locks it flat and stops it from spinning after washing.

Sewing Elastic: Braided, Knit, Woven & FOE

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