The back is laced up corset-style, so it can easily adjust to fit 86-96.5cm/34-38” and 3 sizes are given for A cup/B cup/C cup.
To fit A cup: 150 metres/164 yards
B cup: 182 metres/199 yards
C cup: 214 metres/234 yards
3mm crochet hook or size required for gauge of 28 stiches and 13 rows = 10cm/4”
Stitches used: ch, ss, sc, dc.