To pick up a dropped stitch purlwise from the outside, you need to recreate the purl “bump.” Insert the crochet hook into the dropped stitch from back to front, and use the hook to pull the strand through the loop from front to back. When you pick up the dropped stitch, the fabric might appear loose or elongated.
How do I fix a dropped knit stitch?
With the safety needle, go underneath the strand of yarn above the dropped stitch. Then, pull the dropped stitch over the strand of yarn and off the needle. The dropped stitch has climbed up by one row. We’ll continue to move it up, row by row, until it reaches the main needle.