You will need a cable needle.

You will also need 6 buttons, approximately 1/2” (15 mm) each. Rowan used # TGB5250 Pearly and Matte Shell textured finish buttons, from Textile Garden in the UK.

Finished measurements:
Chest circumference: 32.5( 36.5, 40.25, 44.25, 48.25, 52.25, 56, 60, 64.5)“ 82.5( 92.5, 102.5, 112.5, 122.5, 132.5, 142.5, 152.5, 164) cm
Finished length: 22( 22.75, 23.5, 24.5, 25.25, 26, 26.5, 27.25, 27.5)” 56( 58, 60, 62, 64, 66, 67, 69, 70) cm
Sleeve seam: 17.25( 17.75, 17.75, 18, 18, 18, 18, 18, 18)“ 44(45, 45, 46, 46, 46, 46, 46, 46) cm

Yarn used:
Rowan Alpaca Classic
Shade 133 Forest - 7(9, 10, 11, 12, 13, 13, 14, 15) balls