You will also need approximately 1/2 yard (40-45 cm) of 30mm elastic.

Finished measurements:
Back Waist: 8.25(9, 9.25, 9.75, 10.5)“ 21(23, 23.5, 24.5, 26.5) cm
Length: 8.25(8.25, 9, 9, 9)” 21(21, 23, 23, 23) cm

Yarn used:
Rowan Baby Merino Silk DK
Dawn 672 3(3, 3, 4, 4) balls