Size Bust Underbust AU/UK/NZ US
XS 75-79 63-67 6 2
S 80-84 68-72 8 4
M 85-89 73-78 10 6
L 90-94 79-83 12 8
XL 95-99 84-88 14 10

All measurements are in cm.
Nicola is 168cm, AU 6; wears size XS.