You will need a cable needle.

Finished measurements:
Bust circumference: 37(42, 46.5, 51.5)“ 94(107, 118, 131) cm
Length to shoulder: 26.75(27.5, 28.25, 29)” 68(70, 72, 74) cm
Sleeve length to underarm: 20” (51 cm)

Yarn used:
Rowan Hemp Tweed
Shade 141 Almond - 13(14, 15, 16) balls