Taken from Knit Noro 1 2 3 Skeins: "A soft-hued lace collar with ruffled edges is an accessory that's both sweetly retro and distinctly modern."
This pattern is from Knit Noro 1 2 3 Skeins, pg 104 - Lacy Collar.
Size US 2 - 24" circular needles, US 3 - 24" circular needles, US 4 - 24" circular needles, D crochet hook (or size needed to obtain gauge), and one .5" button are required but not included.