Cardigan requires:

4, 5, 5, 6, 6 x 50g balls of main colour Enamel 013
1, 1, 1, 1, 1 x 50g balls of contrast colour Clay 001
1, 1, 1, 1, 1 x 50g balls of contrast colour Shade 002
1, 1, 1, 1, 1 x 50g balls of contrast colour Anthracite 003

The version published in Knitting Magazine 049, April 2008, Kids Knits Supplement includes instructions to modify this into a front buttoned waistcoat.