That's totally not how armor functioned in those times. The picture I included is of Joan of Arc. Do you see breasts that are lifted and separated in that picture? Nope. And you can put padding under a breastplate that may be a bit too large, because that's what they do sometimes for guys who don't have breasts in the manner that women do.

Cool picture and ya I am sure there have been both and they should follow that, but they armor style in destiny wouldn't work with breastplates

Sooo... you don't know for sure, is what you're saying. Come back with legitimate historical evidence that concave breastplates were used regularly, and not as an afternoon experiment, and I won't write you off as completely foolish.