You will need 6 buttons, approximately .5” (12 mm) each. Rowan used brass buttons #TGB1167 from Textile Garden in the UK.

You will need two cable needles for the pleats.
You will also need a size US 3 (3.25 mm) circular needle at least 48” (120 cm) long for finishing.

Finished measurements
Chest circumference: 32.75( 37, 41.25, 45.25, 48.5, 52.75, 57, 61, 65)“ 83.5( 94, 104.5, 115, 123.5, 134, 144.5, 155, 165) cm
Finished length: 20.75( 21.75, 22.5, 23.25, 24, 24.75, 25.25, 26, 26.5)”
Sleeve seam: 1.5” (3 cm) for all sizes

Yarn used:
Rowan Pure Alpaca
Shade 121 Sunset - 9(10, 11, 12, 13, 15, 16,1 7, 18) balls