You will need a cable needle.

You will also need a size US 3 (3.25 mm) circular needle at least 48” (120 cm) long for the button band

You will need 4 buttons, approximately 7/8” - 1” (23 mm). Rowan used brown corozo buttons from Textile Garden in the UK.

Finished measurements:
Chest circumference: 58.5( 61.5, 67.5, 70.5, 76.5, 79.5, 82.5, 85.25, 91.5)“ 148.5( 156, 171.5, 179, 194.5, 202, 209.5, 217, 232.5) 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: 11.5( 11.75, 11.75, 12.25, 12.25, 12.25, 12.25, 12.25, 12.25)“ 29( 30, 30, 31, 31, 31, 31, 31, 31) cm

Yarn used:
Rowan Alpaca Soft DK
Shade 215 Clover - 15( 16, 18, 19, 21, 22, 23, 25, 26) balls