The first step is self-confidence. No woman is perfect.
The second step is to buy a bra with good shape, sufficient padding and symmetrical size.
With a bra, it's easy to solve. No one else can see it, only the husband can see it.
The third step is to communicate with your husband more and let him understand you. In the eyes of your lover, you are the most perfect.
The fourth step is to change the husband if he doesn't understand.