“You may say I’m a dreamer, but I’m not the only one. I hope someday you’ll join us. And the world will live as one.”
― John Lennon
Finished measurements:
Child: G ( 4.25mm)hook 20 inches
Adult: I hook ( 5.50 mm)hook Small 22 inches, Medium 24 inches, Large 26 inches

Pattern includes directions for a beanie, a slouchy hat, and a messy bun Style.
American Crochet terms, Pictures of almost every round.