I was considering going flat. I had Mastectomy with axillary clearance, Chemo RT and Aromatase Inhibitor tablets.
I hated being lopsided. I'm not a small lady, and ended up deciding not to go flat, because I would be larger on my bottom half. I had a Latisimus Dorsi Reconstruction and a prophylactic Mastectomy to the other side. Done at the same time. Bilateral tissue expanders, then changed to Breast Implants. I am very happy with my choice.
I no longer need Mamograms etc. I have no evidence of Breast cancer, but I still have checkups with the Oncologist. I don't know if this helps. But that was my train of thought.