Today I finished 1/2 of the skirt part of the dress. What I did was:

Cast on 88 st for small, 96 for medium, 104 for large.

Knit a row pearl a row until piece measures 11 cm.

Decrease 2 st. (to decrease at the beginning k1, sl, k1, PSSO. knit till 3 left at the end. k2tog, k1.)

Continue to knit a row pearl a row and decrease every 2 1/2 cm. Do this 12 times, until piece measures 40 cm. Bind off. Repeat. Then sew the two together at the sides.