First of all, calm down. Second, I doubt there are many people who consider a visible navel the height of "sexy", the thing is little more than a lint collector after all. Your attitude towards this topic is clear form your comments regarding high heels with armor, so kindly stop trying to act like you're some kind of crusader for fairness.
Before we proceed though, we should probably review all the armor and gear sets in the game to see whether male characters have any gear that bares things that the female version does not, or gear sets that accentuate masculine features on the wearer, regardless of gender. The double standard here is those cloaking their puritanical leaning with arguments related to the real world practicality of armor in what is - after all - a fantasy game, or those leaping to the defense of female characters who obviously are horribly exploited by having their lint collectors shown in Dragoon AF gear.
Now, since we're talking about double standards in gear, I'm pretty sure that there are a couple of beach sets that essentially have the male bare chested, while the female has her chest clothed. Is that not a double standard too? Nipples and breasts on females are considered sexual, despite the fact that their primary function is top provide nourishment for their children. Admittedly they are also considered erogenous zones. Oddly enough, nipples and 'breasts' are not the exclusive preserve of females, males have them too (shocking I know) and they are also considered to be erogenous zones. So, why on eorzea is there a double standard?
Oh, that's right because there are certain conventions in clothing that are considered female traits and others that are considered male. Why are you surprise then that there are differences in gear between female and male? It should be obvious that such differences would exist and that female gear would accentuate the feminine characteristics, and male would accentuate masculine characteristics.
To suggest otherwise is indeed a double standard since you are implicitly (based on your arguments used in your posts) saying that all gear should be the same, and fit the male characters properly. Realism be damned, this is a game, immersion be damned you can wear a snowman head or pumpkin into battle. Those arguments hold no water, and all it comes down to is the attitude of players like yourself who find offense in things like the Dragoon AF gear, but apparently not in the beach wear, since to my knowledge there has not been a longstanding complaint here about the existence of the male chest in beach wear.
Which, by the way, goes directly to your point about a spear and a thong. Since there would be an obvious double standard allowing the male Dragoon to be topless, but not the female. Or, are you suggesting that as proof that you do not find female flesh sinful?
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(yes the final paragraph is in jest, I hope you realize that...)