Circumference: 16.5 18.5, 20.5 inches

All sizes use less than 1 skein of KnitPal Cotton to the Core Worsted.

Chemo Caps make a great charity donation gift. Check online to locate your favorite charity and confirm their rules for gifting.
Sizing may sound small but compensates for hair loss and for the stretch factor of cotton blend yarn.
Chains at beginning of each round Always counts as a stitch.
Magic Ring could also be used to start the crown, but do not pull the ring too tightly, to allow the first round to have a little gap to match the rest of the design.