Top

 XS  S  M  L
Bust(in) 32 34 36  38
Cup AA-A B C-D DD
UK 6-8 8-10 10-12 12-14
 
Please go off cup size as this style has adjustable waist straps. If in doubt, please size up in this style.

Bottom
XS  S  M L
Waist(in) 26 28 30 32
Hips(in) 34 36 38 40
UK 6-8 8-10 10-12 12-14
 
If in doubt, please size up.

International Size Chart
 XS S M L
UK 6-8 8-10 10-12 12-14
EU 36 38 40 42
US 2-4 4-6 6-8 8-10