You will need 3 buttons. Rowan used 7/8” (2.2 cm) shell buttons.

You will also need a size US 9 (5.5 mm) circular needle at least 48” (120 cm) long for finishing

Finished measurements
Bust circumference: 41.25(45.75, 50, 53.25, 57.5, 61.75, 65.25, 69.5, 73.75)“ 105( 116, 127, 135, 146, 157, 165.5, 175.5, 182.5) cm
Finished length: 16.75(17.5, 18, 18.5, 19.75, 20.5, 20.75, 21.75, 22)” 42(44, 46, 47, 50, 52, 53, 55, 56) cm
Sleeve length: 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 Tweed Haze
Shade 550 Winter - 6(6, 7, 7, 8, 9, 9, 10, 10) balls