Worked using the butterfly stitch from the top down.

Stitches used
Ch = chain
Sl st = slip stitch
Hdc = half double crochet
Dc = double crochet
Tc = treble crochet also known as triple crochet

Gauge:
Completed butterfly, 7 sts wide x 3 rows = 2 ¼” x 1 ¼” 5.7 x 3.2 cm

Finished Measurements:
4 ½” high x 9 ¾” wide 11.5 x 25 cm - since it’s circular, 9 ¾” is the measurement while it is laid flat.

NOTE: I have written it out using the conventional methods, but when I made mine I used foundation hdc to start instead of chaining and chainless starting hdc instead of ch1, hdc in same st as joining and chainless starting dc instead of ch3. You can do the same if you wish.

As you work the pattern, the butterflies will form pointing downward over 3 rows.

You can add an edging, if desired, do more rows of ribbing, and/or make the band narrower or wider by decreasing or increasing the number of rows. You could also make it narrower in the back where it lays nears the neck.