You will need a cable needle.

You will also need circular needles in both size US 6 (4.0 mm) and US 8 (5.0 mm) in both 16” (40 cm) and 32” (80 cm) long.

Finished measurements:
Bust circumference: 55(62, 69.5, 77, 84.5)”/140(158, 177, 195, 214) cm
Finished length: 27.5(27.5, 28.25, 28.25, 29.25)”/70(70, 75, 75, 74.5) cm
Sleeve length to dropped armhole: 11.5(11.5, 11.75, 11.75, 12.25)”/29(29, 30, 30, 31) cm

Yarn used:
Rowan Kid Classic
Shade 828 Feather - 13(14, 15, 16, 17) balls