What can one do about a breast that isnt equal to the other..about 70% difference?

Beholder of beauty: Mild/slight asymmetry of the breast is quite common and most other people won't notice it with just casual clothing. Some have a bit more asymmetry and thus requires a bit more covering with "conforming bras" etc...If you are not happy with simple covers, consult a plastic surgeon for correction. If large, surgical reduction of the larger one, or if small, then implant in smaller one. Good luck.