From the Knit Picks Website:

Inspired by vintage garments, this blouse is sure to flatter every size. Worked circularly with a generous rib at the bottom, the Jonquil Blouse is accented with a long eyelet collar and delicate buttons at the back. It will surely be a ‘go-to’ in your wardrobe for many seasons to come!

Needles:
US 2 (3.0mm) 24? or longer circular needle depending on circumference knit plus 2 DPNs or size to obtain Rib gauge;
US 3 (3.25mm) 24” or longer circular needle plus 16” circular or DPNs or size to obtain stockinette stitch gauge.