You will need a cable needle.

Finished measurements:
Bust Circumference - 35.5(39, 44.5, 47.5, 51)“ 90, 99, 113, 121, 130) cm
Length: 24” (61 cm)

Yarn used:
Rowan Handknit Cotton
A. Turnkish Plum 277 4(4, 4, 5, 5) balls
B. Ice Water 239 2 balls for all sizes
C. Cloud 245 2(2, 2, 2, 2, 3) balls
D. Bleached 263 1(2, 2, 2, 2) balls