How do you stabilize stretch fabric?
To stabilize the seam, simply sew some non-stretch ribbon or stay-tape into the seam as you sew it. Knits will need to be hemmed differently than wovens because you’ll be needing an element of stretch to the seam. This unfortunately means that a regular straight stitch is off the menu!
Why is my thread bunching underneath?
A: Looping on the underside, or back of the fabric, means the top tension is too loose compared to the bobbin tension, so the bobbin thread is pulling too much top thread underneath. By tightening the top tension, the loops will stop, but the added tension may cause breakage, especially with sensitive threads.