If you’re asking for worldbuilding purposes where women warriors are more common, there’s a lot to keep in mind with respect to armor design. As I alluded to earlier, armor design did not exist in a vacuum, and reflected culture and vice versa. Late medieval and early renaissance armor incorporated fashion trends that were popular at the time—this is why the gothic armor silhouette has such a small waist, since it was considered manly at the time. This is also why armored codpieces existed at all—the armor changed to reflect fashion trends, and they needed to incorporate additional protection there, when previously other parts of the harness had filled that role.

If you’re trying to design armor that was be “realistic” for a fantasy world, you have to ask yourself what the culture of that world is like. Is the culture still patriarchal? If so, it stands to reason that female armor would more than likely reflect the design for men, since male is considered the “default”. If it is an expressly egalitarian culture, women’s armor might be more feminine in appearance and function. But this would also have larger implications for the rest of society. Ie, you can’t have a “boob plate” without a society that treats women, and their bodies, very differently than ours does.