You will need 8 buttons for the long-sleeved cardigan and 6 buttons for the short-sleeved cardigan.

Finished measurements
Bust circumference: 34(35.25, 37.5, 39.5, 41, 43.25, 45.5, 47.5)“ 86(89.5, 95.5, 100.5, 104, 110, 115.5, 120.5) cm
Finished length (L/S): 24( 24.25, 24.5, 25, 25.5, 26, 26.5, 26.75)” 61(61.5, 62, 63.5, 64.5, 66, 67.5, 68) cm
Sleeve Length (L/S): 17(18, 18, 18, 18.5, 18.5, 18.5, 19)“ 43(45.5, 45.5, 45.5, 47, 47, 47, 48) cm
Finished length(S/S): 18(18.5, 19.25, 19.75, 20.5, 21, 21.75, 22.25)” 45.5( 47, 49, 50, 52, 53.5, 55, 56.5) cm
Sleeve length(S/S): 6.25( 6.5, 6.75, 7, 7.25, 7.5, 7.75, 8)“ 16(16.5, 17, 17.5, 18.5, 19, 19.5, 20.5) cm

Yarn used:
King Cole Bamboo Cotton Dk
Long Sleeve Cardigan
Shade 1812 Cinnamon - 3(4, 5, 6, 7, 8, 9, 10) balls
Short Sleeve Cardigan
Shade 625 Old Gold - 3(4, 4, 5, 6, 7, 8, 9) balls