Yardage listed in Ravelry is for yarn B, Kidsilk Haze.

Yarn:
Fine Milk Cotton: 5, 5, 5, 6, 6 x50g
Kidsilk Haze: 4, 4, 4, 5, 5 x25g

Buttons: 7 13mm buttons

Tension: Using yarn B, 29 sts and 39 rows of 10cm measure over stockinette stitch using 2.75mm needles. Using yarn A, 26 sts and 37 rows measured over pattern using 2.75mm needles.