You will need 2 buttons for the strap finishings. Sirdar used their button, B 5611-0002

Finished measurements:
Circumference at skirt bottom: 24( 24.75, 26, 26.75, 28.25)“ 61(63, 66, 68, 72) cm
Finished length: 16(17, 17.75, 18.5, 19.25)” 41( 43, 45, 47, 49) cm

Yarn used:
Sirdar Snuggly Replay
A. 130 Hide-Out Green - 2(3, 3, 3, 3) balls
B. 128 Bubblegum Pop - 1 ball for all sizes