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I use a basic sewing machine, and if I sew a heavier piece of fabric on top of a much lighter weight piece, the bottom lighter fabric can pucker a bit, even if I baste them together. I work around this by always putting the lighter pieces on top. However, I cannot do this when sewing on invisible zippers because the heavier zipper must be sewn on top. I solve the puckering problem by putting a piece of paper underneath all layers and sewing it along with the fabric. After that, I rip out the paper, and voila!, no puckering. Printer paper works great for this purpose.
Contributed by Betty Chang