The finished cowl is 9” (23 cm) wide by 10.5” (27 cm) tall.
You'll need 220-250 yd (202-229 m) of DK weight yarn. A note about yardage: the sample used 213 yd, and many DK skeins have 220 yd. If you find yourself a smidge short, skip working the very last round and just bind off instead. Nobody will notice. I knit my sample in Onyx Fiber Arts Sophia Hand-Dyed Semi-Solid on DK-weight base, 100% Superwash Merino, 250 yd (229 m), 115 grams.
4” (10 cm) square = 15 stitches and 30 rows in seed stitch after blocking. You'll need one set of needles for your preferred style of circular knitting in a size to match gauge listed above. The suggested needle size is US 6 (4.0 mm).
You'll need one stitch marker for end of round, plus five optional markers between pattern segments, a Size G (4.5 mm) crochet hook (optional), and a tapestry needle for weaving in ends.
This pattern is written for intermediate knitters. It is knit in the round, and uses bobbles, increases, and decreases.