Fisherman’s rib stitch
Knitting into the stitch below creates a cushioned rib without separate yarn-overs.
Counted practice swatch
Cast on 21 stitches. Knit one setup row. k1b means knit into the loop in the row below, allowing the stitch above to drop off.
Work the repeat
Every following row: k1, [k1b, p1] 9 times, k1b, k1. There are 21 stitches throughout.
Read the fabric
The first and last stitches are plain knit edges. Work the k1b gently: entering two rows below would unravel more fabric than intended.