My oh my, sorry for taking my time in replying this. Thanks for the very detail insight!
You are correct, in regards to the female shaped breast plate. This is similar to the "muscle cuirass" worn by the Greeks, Roman and Spartan warriors. But from what i have read, this was made up of 2 layers, the protective Cuirass and then the "muscle shaped" metal/leather layer on top of it. Thus, giving practical protection and look good at the same time
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I understand that back then, at least to the best of my knowledge, women had to worn the armor which were fashioned for their most active users, men. They were heavy, bulky, most of the times uncomfortable, and finally, very very expensive. It was possible to have a custom-tailored armor made specially for the ladies of war, but they would have been outrageously expensive, which if we take account of the social status of women those days, she would have had to be very rich. So for the more common warriors, they used what was already available, either from the blacksmith or looted from the fallen
I'm thinking of making another drawing about this, as a comparative study, hopefully soon.