Size Bust Underbust AU/UK/NZ US
XS 76-80 66-70 4-6 2-4
S 81-85 71-75 8 6
M 86-90 76-80 10 8
L 91-95 81-85 12 10

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