Neck Seam

Turn legs inside in.
Sew a running stitch in a straight line across body approx 1/4 of the way down from the top edge of fabric. I usually fold over the 1/2 cm (1/4") seam allowance before I stitch the line.
Gently pull the running stitch to gather the neck together, but don't secure it as you'll need to pull it open later.
