How do I measure the right size?
If you start with your tape measure between the breasts and stop under the armpit just after the underwire of your bra. Then you have the right size that suits you.

As an example: if you measure 28 cm here, it means that you have a size L

23/24 = XS
24/25 = S
26/27 = M
28/29 = L
30/31 = XL
32/33 = XXL
34/35 = XXXL