You may wish to work back and forth using circular needles. Rowan suggest those that are at least 40” (100 cm) long. (Though you should be able to use slightly shorter needles, too.)

Finished Measurements:
Bust circumference: 33.5( 37.25, 41.5, 45.25,49.5, 53.5, 57.25, 61, 65.25)“ 85(94.5, 105.5, 115, 126, 136, 145.5, 155, 166) cm
Finished length: 23.5( 24, 24.5, 25.5, 26.25, 26.75, 27.25, 27.5, 28)” 59.5(61, 62.5, 65, 66.5, 68, 69, 70, 71) cm
Sleeve to armhole: 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 Summerlite 4 Ply
A. 449 Pickle - 3(3, 3, 3, 4, 4, 4, 4, 5) balls
B. 445 Green Bay - 2(3, 3, 3, 3, 34, 4, 4, 5) balls
C. 431 Pepper Pot - 2(3, 3, 3, 3, 4, 4, 4, 4) balls
D. 441 Rooibos - 1(1, 1, 1, 2, 2, 2, 2, 2) balls