You just don't get it, do you? If you consider it objectifying as an outfit, then it shouldn't matter who designed it, the outfit is still "objectifying" according to your standards. To insist that it's only objectifying if it's made by a male IS SEXISM.
You keep saying they have no option to wear "that nice piece of gear" because it's objectifying. If they dislike the gear for the way it is, then they really don't consider it a "nice piece of gear" but rather are trying to push their own agenda instead of appreciating the art for what it is, and what it was intended to be.
You are never at ANY point in this game EVER forced to wear revealing armor.
There is no such thing as a "preferred" dress code. If there is a dress code, you abide by it or you face consequences, otherwise there is absolutely no point to having a dress code in the first place if you're just going to let people wear whatever they want. Please show me an example of a business that has a "preferred" dress code. I would love to be proven wrong.
Also, no, quitting is not equivalent to having the option to wear other attire. In the situation that you described, they would be quitting simply because the revealing armor exists and that they refuse to wear anything else because of their masochistic tendencies or whatever is compelling them to not glamour over this item they seem to hate so much.
I still don't get why you're so obsessed with the midriff on the female version of the Dragoon armor too, while completely neglecting that the entire freaking armor set, regardless of gender, is incredibly impractical. It's also pretty damn tame too. Lets get real here, it's literally just a belly. Both men and women have them. What is the problem?
The worst part is that you completely ignore that there are revealing sets in the game for men too. Your argument holds no ground, especially here (this game), and you are absolutely 100% wrong in your stance on this.