You will need a cable needle.

You will also need a set of double pointed needles size US 15 (10 mm) and a circular needle no longer than 36( 40, 44, 48, 52, 56, 60, 64, 68)“ 90( 100, 110, 120, 130, 140, 150, 160, 170) cm

Finished measurements:
Chest circumference: 37.25( 40.75, 44, 47.75, 53, 56.5, 59.75 , 63.5, 68.75)“ 94.5( 103.5, 112, 121, 134.5, 143.5, 152, 161, 174.5) cm
Finished length: 24.5( 25.5, 26.5, 27.25, 28.25, 28.25, 29.25, 30, 30)” 62.5( 65, 67.5, 69.5, 71.5, 72, 74, 76.5, 76.5) cm
Sleeve seam:17.75( 18, 18, 18.5, 18.5, 18.5, 18.5, 18.5, 18.5)“ 45( 46, 46, 47, 47, 47, 47, 47, 47) cm

Yarn used:
Rowan Big Wool
Shade 061 Concrete - 8(9, 10, 10, 11, 12, 12, 13, 14) balls