I liked the woman in the picture, but I must ask, wouldn’t D-cups be as restricting on a woman who needs to fight? Even if it was shaped like the armor in the picture, the breasts would cut into her range of motion and I would think it would render archery to be rather difficult. Anyway, they are mostly fat cells and sword practice involves a lot of upper body exercise. Still fascinating concept and it answered my question I never knew I had about what armor for women should look like.

REFERENCING the post you’re referring to with a link or description is your friend!
“The picture” is usually not enough to tell what you’re commenting on in my askbox.

I can only assume you’re referring to this post, as it is the most recent one and mentions D-cups.
Though I feel like I’m not the person the question should be addressed to, as I reblogged it from new Repair-Her-Armor admin blog and considering the woman from the image has a tumblr account too; but I’ll try my best to answer.

I’m pretty sure Astro from ria-RHA was referring to D-cups solely in the context of sex-appeal, as the original question was about designing a female character who’s well-protected and attractive to (straight) men at the same time.

First of all, let us remember that women usually don’t decide how big their chests are. And women of all sizes (that includes breasts) are capable of impressive physical fits that would make them excellent fighters:

Second, it is true that big breasts may come in the way while in fight, but a well-designed armor paired with a decent underwear (sports bra) should flatten them enough without being uncomfortable. A well-trained sportswoman/female warrior would most likely know how to handle a fight without her own body causing inconvenience to her.

Also keep in mind that weight loss (caused, for example, by swordfight training) can, in some cases, reduce cup size.