Question: How do you sew stretchy knits?

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.

What tension should I use for elastic?

Generally elastic works best when stretched 3-8%, with 8% only being used on the smaller parts of the garment as it’s a bit extreme, as remember the more you stretch the elastic the more stitches you are putting on that space of elastic.

What tension should I use for thin fabric?

Use size 70/10 for really thin cotton like voile, size 80/12 for light to medium weight cotton, and 90/14 for thick cotton like denim.

How do you keep knits from puckering?

To reduce the puckering, I take the following three simple steps when sewing seams: (1) use a walking foot to help ease the fabric into the sewing machine, (2) stabilize the fabric with tissue paper, and (3) press the seam after stitching.

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