Q What is the cause of puckered stitches? What is the best way to avoid a rippled seam? A Judith Neukam, Threads' editor-at-large, replies: There are multiple causes for puckered stitches, many of them related to thread tension. Some or all of them may come into play in your sewing. When you try to eliminate puckers along a seam, you may need to experiment with one adjustment at a time to see which one, or which combination, gives you the best results. Thread is manufactured under tension and it is slightly stretched on a spool. Polyester thread stretches more than cotton. When wound onto a bobbin, the thread accrues additional tension. The sewing machine applies even more tension to the thread during stitching.
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