You will need a cable needle.

Design is worked from the top down, with yarn doubled throughout.

You will need circular needles size US 6 (4.0 mm) - one no longer than 16’ (40 cm) long, and another no more than 35( 36, 40 ,44, 44, 48, 52, 56, 60)“ 80( 90, 100, 110, 120, 130, 140, 150, 160) cm long

Finished measurements:
Chest circumference: 34( 37.75, 41.5, 45.25, 49.75, 5.5, 57.25, 61, 66.25)“ 86.5( 96, 105.5, 115, 126.5, 136, 145.5, 155, 168.5)”
Finished length: 19.5( 20, 20.75, 21.5, 22.5, 23, 23.75, 24.5, 25.5)“ 49.5( 51, 53, 54.5, 57, 58.5, 60.5, 62, 64.5) cm

Yarn used:
Rowan Kidsilk Haze
Shade 590 Pearl - 4(5, 6, 6, 7, 8, 9, 9, 10) balls