CO : cast on
BO : bind off
ES : edge stitch, k on right side, p on wrong side
TS3 : Triple stitch. Slip two stitches together as if to knit two together and return to left needle with needles tip to tip. Then knit 3 stitches together through the back loop, yo, and knit again all through the same 3 stitches.
K : knit
P : purl
St or sts : stitch or stitches
Repeat work between ()

Design is a multiple of 4sts +3 plus edge stitches
Worsted weight yarn and size 7 needles
CO 25 sts
Row 1: (wrong side) p
Row 2: (right side) ES, (TS3, K1) to last 4 sts, TS3, k1
Row 3: p
Row 4: ES, k2, (TS3, k1) to last 2 sts, k2

Repeat these four rows to fit around head and BO on a purl row.
Seam short ends together and wear.