For correct tension, try T7.

Rib Tension
41 stitches and 44 rows = 10 cm (4 in) over 2X1 mock rib.
For correct tension, try T4.

Measurements
To fit chest sizes
50, 55, 60 cm (20, 22, 24 in)
Skirt length
20, 25, 29 cm (8, 10, 11½ in)

Materials (from The Family Knitting Book)
Wendy Courtellon 4 Ply, Marina Crêpe 4 Ply, or Wendy Pure Wool 4 Ply, 20 gram balls.
Colour A: 9, 10, 11 balls
Colour B: 1, 1, 1 ball
2 buttons.