Yarn is DK, not fingering.

CO 120 (19” circumference). K 4cm facing, purl turning rnd, knit 4 cm, and create hemmed brim by joining round with cast-in edge.

Knit plain rounds to desired height (about 17 cm). On alternate rounds, work SSK/K2tog at 4 equidistant points until ~16 stitches remaining; graft closed.