You will need two buttons for the straps.

Finished measurements:
Chest circumference: 16.5( 18, 19.75, 20.5, 21.25, 22)“ 42( 46, 50, 52, 54, 56) cm
Hip circumference: 18( 20, 21.75, 22.5, 22.75, 23.75)” 46( 51, 55, 57, 58, 60) cm
Finished length: 20.5( 21.75, 22.75, 24, 25.5, 27.5)“ 52( 55, 58, 61, 65, 70) cm

Yarn used
Sirdar Snuggly DK
A. 446 Rice Pud - 2(2, 2, 2, 3, 3) balls
B. 484 Cherry Pie - 1 ball for all sizes
C. 326 Denim Blue - 1 ball for all sizes