With my machine/operator combo, the 7d(10d) is a pain to sew, it tends to pucker especially if on the bias near the edge. Painters tape to stiffen the fabric generally and close to but not on the stitchline helped a lot.
It also works for noseeum in the stretch direction, but is easier if applied before cutting from the larger parent piece to make sure you don't distort the shape.
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