Armor in which the breasts are individually shaped is extremely impractical. Say you're in a sword fight. The point of armor is to deflect an oncoming sword. Armor with two breasts on it directs the sword TOWARDS the sternum, which is almost as dangerous as wearing no armor at all. The historical evidence supports this; Ancient warrior women such as Vikings would never had two breast plates. Not that armor can't also be in some way flattering, but if it's realism we're striving for (which I know isn't always the case), the ladies will not have their individual breasts discernible. So those are my thoughts on the matter.