You will need 2 buttons for the sweater and 4 for either vest or cardigan.

Finished measurements:
Sweater:
Chest circumference: 20.5( 23.25, 24.5, 27.25, 28.5)“ 52(59, 62, 69, 72.5) cm
Cardigan and Vest
Chest circumference: 21.5( 24.25, 25.5, 28.25, 29.5)” 54.5( 61.5, 64.5, 71.5, 75) cm
Finished length - all: 11.5( 12.5, 13.5, 15, 16.5)“ 29(31.5, 34.5, 38, 42) cm
Long Sleeve length: 7(8, 9, 10, 10.5)” 17.5( 20.5, 263, 25.5, 26.5) cm
Short Sleeve length: 2.5( 3(3.25, 35., 4)“ 6.5(7.5, 8.5, 9, 10) cm

Yarn used:
King Cole Comfort Chunky
Sweater
Shade 427 Aqua - 2(3, 3, 4 ,5) balls
Vest
Shade - 420 Grape - 2(2, 3, 3, 4) balls
Cardigan
MC. 496 Mint Chip - 2(2, 3, 3, 3) balls
CC 428 Dill - 1 ball for all sizes