You will need a size US 5 (3.75 mm) and size US 6 (4.0 mm) circular needle, no more than 24” (60 cm) long.
You will also need a set of 4 double-pointed needles in both sizes.

Finished measurements:
Bust circumference: 33.25(38, 42.25, 46.25, 5.5)“ 86(96.5, 107, 117.5, 128) cm
Finished length: 22(22.75, 23.5, 24.5, 25.25)” 56(58, 60, 62, 64) cm
Sleeve to underarm: 17.75(17.75, 18, 18, 18)“ 45(45 46, 46, 46) cm

Yarn used:
Rowan Alpaca Classic
A. 119 Copper Clay - 7 (7, 8, 8, 9) balls
B. 115 Snowflake White - 1 (1, 1, 2, 1) balls
C. 122 Dark Burgundy - 1 (1, 2, 2, 2) balls
D. 130 Dusk - 1 (1, 1, 1, 2) balls
(Note: there was an errata in the yarn requirements. These are the updated amounts.)