I am afraid that it is a tendancy, among TS girls. That said, I am filling in, on the inside of my boobs. If you do not, I am afraid a little artifice and careful choce of clothes, are the answer. I know that I probably look better in clothes, that emphasise projection, rather than cleavage. Take comfort, all well dressed women have to make serious choices, about what best suits their figure! All part of the joy of being a woman!