Here’s a tidy, reversible edging that’s quick to knit! The edging has 12 pattern rows with the backside rows just knit and purl stitches. The stitch count varies from 10 to 20 stitches through the pattern. This edging is best used on a curved edge.
Skills needed: long-tail cast on, knit, purl, slip, k2tog, yarn over, yarn over twice and bind off in stretchy bind off.

Gauge is not important in this pattern. Any block-able yarn/thread will work. Make a swatch to check size and appearance.

3 yards of #10 crochet cotton thread will make about 12 rows
(1 inch) in the stated gauge.