Tips
You can also take the measurement of a bra that fits you well.
Check the cups: if you bend forward at the waist and wear the bra, your breasts should be completely in the cups. The cups should not pucker and your breasts should not bulge.
Check the wearability of the bra: it should fit perfectly when secured on the outermost hook, as it loosens over time and you need to move towards the tightest hook.