Correct me if I'm wrong, but at the time when such style was popular only the "women of certain profession" would allow themselves to appear in public dressed like this.

Makes me wonder if designers didn't notice that fact or if they ignored it knowing that most of their customers either won't notice it themselves or will plainly ignore it...

what are you talking about? just by looking at her and keeping in mind that it is a mmo, you should be able to tell its a paladin in full plate armor (female version ofc)