Yarn is used double throughout.

Just a thought, as I type this - wind the bobbins with double strands of each color, versus two bobbins of the same color???

Finished measurements:
Bust circumference: 43.5( 47.25, 50.75, 55, 58.75, 63, 66.5, 70.75, 74.5)“ 109( 120, 129, 140, 149, 160, 169, 180, 189) cm
Finished length: 30(31, 31.5, 32, 32.5, 32.75, 22, 22.75, 33.75)” 76(79, 80, 81, 83, 83, 84, 86, 86) cm
Sleeve to underarm: 17.25(44 cm) for all sizes

Yarn used:
Rowan Felted Tweed
A. 172 Ancient - 9(9, 10, 11, 12,13, 13, 14, 15) balls
B. 204 Vaseline Green - 2(2, 3, 3, 3, 3, 3, 4, 4) balls
C. 197 Alabaster - 1 ball for all sizes
D. 165 Scree - 1(1, 1, 1, 1, 1, 1, 2, 2) balls
E. 221 Candy Floss - 1(1, 1, 1, 1, 1, 1, 2, 2) balls
F. 199 Pink Bliss - 3(3, 3, 3, 4, 4, 4, 4, 5) balls
G. 200 Barbara - 1 ball for all sizes