3 Rows of skulls graduating from small to large. Make them in 1 color, 3 rows of stripes, or outlined with a row of Contrasting color in between
I would like to give Rosie Dennis, one of my testers, for suggesting the Brilliant option of underlining the skulls with just one row of contrasting color

Small G Hook For Hat (4.00mm) gauge 3.5 sc = 1in 22 inches around by 9 inches deep
F Hook for Rib (3.50mm)
Medium H Hook for hat (5.00mm) gauge 3 sc =1 in 24 inches around by 10 inches deep
F Hook for rib (3.50mm)
Large I Hook For hat (5.50mm) gauge 2.5 sc = 1 in 25 inches around by 11 inches deep
G Hook for Rib (4.00mm)
American crochet terms. Pictures included of many of the steps.
I would like to give Rosie Dennis, one of my testers, for suggesting the Brilliant option of underlining the skulls with just one row of contrasting color