This pinafore dress is part of a twinset with a coordinating sweater.
The dress uses the following amounts of yarn:

Jamieson’s Spindrift, 100% shetland wool (105m per 25gm)

9 (10, 11, 11, 12, 13) 25g balls, shade 1160 (Scotch Broom)-MC
3 (3, 4, 4, 4, 4) 25g balls shade 1290 (Loganberry)-CC

Other Notions
1 pair 2.75mm (US #2) needles
1 pair 3mm (US #2-3) needles
Stitch Markers
Crochet hook
4 buttons
4 press studs