Easy half double crochet beanie (US terms). Worsted yarn, 5 mm hook. Adult small to medium, about 52 cm around. Join each round with sl st to the first hdc and ch 1 (does not count as a stitch).
Round 1: 8 hdc in magic ring. (8)
Round 2: 2 hdc in each st around. (16)
Round 3: (hdc, inc) x8. (24)
Round 4: (2 hdc, inc) x8. (32)
Round 5: (3 hdc, inc) x8. (40)
Round 6: (4 hdc, inc) x8. (48)
Round 7: (5 hdc, inc) x8. (56)
Rounds 8-24: hdc in each st around. (56)
Rounds 25-26: (fpdc, bpdc) around for the ribbed brim. (56)
Fasten off and weave in ends.