Is there such a thing as stretchy thread?
The most common threads used to sew stretch knit fabrics are textured polyester or textured nylon threads like A&E’s Wildcat® Plus or Best Stretch®. Textured threads are ideal for overedge and coverstitch seams because they offer excellent seam coverage and seam elasticity.
What is stretchy thread called?
If the item you’re making needs to be stretchy or form-fitting to the body, you may want to use elastic thread. Only use elastic thread in the bobbin of your sewing machine, and wind it by hand.
Does knitting thread Need Stretching?
If you own a serger then this is the ideal way to sew with knits. A 3-Thread or 4-Thread stitch will secure a seam and still provide good stretch. You can use regular serger thread, wooly nylon thread, or (my favorite) stretch thread. If you own a serger then whipping up t-shirts, skirts, and leggings are a breeze.