From the Knit Rowan website:
Available as a download exclusive this colourful unisex sweater designed by Gemma Atkinson uses Alpaca Colour. The fairisle patterning makes it suitable for the more experienced knitter,

Now available for $7 as an individual download in English at our Ravelry Store

Finished dimensions:
50.5: 53: 56.5: 59: 62: 64: 67: 70.5 cm
20: 21: 22: 23: 24½: 25: 26½: 28 inches

Yarn information:
Version 1 (Blue shading)
A - Blue John 140
9, 10, 11, 11, 12, 13, 14, 15 skeins
1179, 1310, 1441, 1441, 1572, 1703, 1834, 1965 yards

B - Marble 145
2, 2, 2, 2, 2, 2, 2, 3 skeins
262, 262, 262, 262, 262, 262, 262, 393 yards

C - Graphite 142
1, 1, 1, 1, 1, 2, 2, 2 skeins
131, 131, 131, 131, 131, 262, 262, 262 yards

D - Jade 146
1 skein for all sizes
131 yards

Version 2 (Purple shading)
A - Garnet 139
9, 10, 11, 11, 12, 13, 14, 15 skeins
1179, 1310, 1441, 1441, 1572, 1703, 1834, 1965 yards

B - Graphite 142
2, 2, 2, 2, 2, 2, 2, 3 skeins
262, 262, 262, 262, 262, 262, 262, 393 yards

C - Amethyst 141
1, 1, 1, 1, 1, 2, 2, 2 skeins
131, 131, 131, 131, 131, 262, 262, 262 yards

D - Topaz 143
1 skein for all sizes
131 yards