Matching sweater and trousers

Sweater has shoulder opening with button band.

Finished dimensions:
Chest: 57 (62.5, 66, 70) cm
Length to back neck: 22 (24, 27, 30) cm
Sleeve length: 21 (235, 25, 27) cm

Requires:
2 (3, 3, 4) x 50g balls yarn in Bottle Green
2 (3, 3, 4) x 50g balls yarn in Saxe Blue
1 x 50g ball yarn in White
1 x 50g ball yarn in Black
3 (3, 3, 4) buttons