Size Bust Underbust AU/UK/NZ US
XS 76-80 66-70 4-6 2
S 81-85 71-75 8 4
M 86-90 76-80 10 6
L 91-95 81-85 12 8
XL 96-100 86-90 14 10

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