There is a matching scarf listed on Ravelry as Colours in a Mist Scarf.

Finished measurements:
Bust circumference: 37(41, 45, 49, 52.75)“ 94(104, 114, 124, 134) cm
Finished length: 23.25(24, 25, 25.5, 26.5)” 59(61, 63.5, 65, 67) cm
Sleeve to armhole: 17.75 (17.75, 18, 18, 18)“ 45(45, 46, 46, 46) cm

Yarn used:
Rowan Felted Tweed - for Sweater only
A. 173 Duck Egg - 5(5, 5 ,6, 6) balls
B. 161 Avocado - 1 ball for all sizes
C. 202 Turquoise - 1 ball for all sizes
D. 200 Barbara - 1 ball for all sizes
E. 183 Peony - 1 ball for all sizes
F. 201 Iris - 1 ball for all sizes
G. 150 Rage - 1 ball for all sizes
H. 205 Lotus Leaf - 1 ball for all sizes
I 185 Frozen - 1 ball for all sizes
J. 181 Mineral - 1 ball for all sizes
K. 154 Ginger - 1 ball for all sizes
L. 198 Zinnia - 1 ball for all sizes
M.199 Pink Bliss - 1 ball for all sizes

If you are making both the Sweater and Scarf, you will need:

Rowan Felted Tweed
A. 173 Duck Egg - 7(7, 8, 8, 9) balls
B. 161 Avocado - 1(1, 2, 2, 2) balls
C. 202 Turquoise - 1 ball for all sizes
D. 200 Barbara - 1(1, 1, 2, 2) balls
E. 183 Peony - 1(1, 1, 2, 2) balls
F. 201 Iris - 1(1, 1, 2, 2) balls
G. 150 Rage - 1 ball for all sizes
H. 205 Lotus Leaf - 1 ball for all sizes
I 185 Frozen - 1 ball for all sizes
J. 181 Mineral - 1 ball for all sizes
K. 154 Ginger - 1 ball for all sizes
L. 198 Zinnia - 1 ball for all sizes
M.199 Pink Bliss - 1(1, 2, 2, 2) balls