I had a lot of troubles with this one of mine, the curve kept getting puckered, I did everything that Amy said - pin centre, then pin each of the sides, then ease the curve pinning twice in the section and stitch really slowly, still puckered. Gave up in the end.
Jenny did you take little "pin bites" like she said? Where you make sure not to pin past a seam allowance' width each time (except for the sides.)Also I used a softer more pliable fabric for mine and I think it helps.
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