Kids Ridged Hat

Notes: Each row in the body of the hat begins with a Ch 2 and ends with a sl st into first st of the round. Each row of the band begins with a Ch 1 and ends with a sl st into beginning st of the round.
Abbreviations:
br st - brioche stitch
dc - double crochet
fpdc - front post double crochet
hdc - half double crochet
sc - single crochet
sl st - slip stitich
Hat
Start with magic Ring
R1: Work 10 dc into magic ring (10 dc)
R2: 2 dc in each st around (20 dc)
R3: *fpdc in first 2 st, 2 dc in ea of next 2 dc; repeat from * (10 fpdc, 20 dc)
R4: *fpdc in first 2 st, dc in ea of next 4 st; repeat from * (10 fpdc, 20 dc)
R5: *fpdc in first 2 st, 2 dc in ea of next 4 st; repeat from * (10 fpdc, 40 dc)
R6: *fpdc in first 2 st, dc in ea of next 3 st, fpdc in each of next 2 st, dc in eac of next 3 st; repeat from * (20 fpdc, 30 dc)
R7: *fpdc in first 2 st, dc in next st, 2 dc in next st, dc in next st; repeat from * (20 fpdc, 40 dc)
R8 - 18+: *fpdc in first 2 st, dc in next st; repeat from * (40 fpdc, 20 dc)
Continue repeating this last row as many times as needed to achieve desired length.
Band:
Increase hook size +1
R1: Ch1, hdc in ea st around (60 br st)
R2: Ch2, br st in BLO of ea st around (60 br st)
Repeat round 2 as many times as needed to achieve desired length.