Like I've said, if it's going to be bulky for the men, it ought to be bulky for the women as well. If it more revealing on the women, it ought to look more revealing on the men as well. Armor can make less sense, but it should make less sense equally.
As I've stated elsewhere, "Tightly fitted" in most cases basically amounts to very shiny skin with most people's wants. I keep bringing them up because more oft than not, that's the hop-skip away to what people consider "Female armor". I've clearly made a distinction between "Form fitting" and "Tight", and showing off your character's hips, thighs, and breasts are not "Form fitting". It is pretty damn degrading whenever I want to wear the DRG AF and I've got to deal with the ridiculous bellyhole (Or lack of scalemail if you want to be that pedantic about wording) and visible black bra that doesn't doesn't exist on the men's version, because I can tell you, that bellyhole (Or Boob window, extra cleavage, or lack of armor to accentuate the woman's body) isn't to make it "Form fitting".
Cool, excuse me for wanting women in armor to look as serious as men do in armor. You keep using "tightly fitted" (most people use this to mean panted on metallic "armor") and form fitting interchangeably. This is "Tightly fitted" http://i2.wp.com/www.tor.com/wp-cont...boob-armor.jpg This is form fitting http://i.kinja-img.com/gawker-media/...vl5l5nmpng.png See the difference? If you consider "Tightly fitted" serious, would you take http://images1.fanpop.com/images/pho...-1000-1500.jpg as serious armor? Considering I'd look at a dude changing into battle wearing a loincloth and ask what the hell is he doing, yes those who wear little clothes and are charging into battle aren't something to be taken seriously. Seriously, ask yourself, if a dude came up to you saying that he's a proud warrior and all he's wearing is a metal codpiece, would you take him serious? If so, why?
Seeing all the people advocating for "Tight fitting feminine armor must be the case for women", I'd say otherwise. Whenever armor in game has an intent that it's trying to invoke, such as fighting dragons with the DRG AF it really shouldn't sway into the more silly design that the girl's version of it has, least the question of "Why don't the men also have the bellyhole as well?" be brought up. It's armor. It's meant to be protective. Considering the direction FFXIV takes with armor in that the fantasy setting, IE the armor to looks more bulky and still works, why should that change just for the girls? Make silly more revealing or "tightly fitted" armor for glamours, because they're not suppose to invoke a feeling of actually being protective armor within FFXIV.
Cool, I'm a girl too! Women are also asking for properly fitted gear that doesn't have sudden and unneeded changes to the women's version to make it look more "Feminine". Generally, developers who are straight men (As that is how things tend to end up in most industries) will develop armor that suits their tastes, ie men are more suited to power fantasies, women are more suited to what they want women to look like. SE has done a wonderful job so far of not doing that with the armor, with a few exceptions. I'm just hoping they continue their streak with only a few blemishes (Look at the folks asking for men versions of some the women exclusive gear or the weird lack of scalemail on the DRG AF for girls). I'm just hoping they fix those few blemishes as well, perhaps by adding a "Bellyhole edition" of the DRG AF (Avaliable for men and women!) and making the covered version default.
Then why don't they just change the armor to have a closed bellyhole and add in a glamour version with the bellyhole (Avaliable for both men and women)? No need for a toggle in the UI, just model work to make it available for men and women and an addition of the glamour bellyhole version somewhere in the game.
The X or Y Chromosome primarily function in determining what the primary set of hormones are released throughout one's life, from prenatal and onward. This of course affects a lot of things, however look at how someone deprived of any testosterone (Such as a eunuch) develops as opposed to a man with a steady stream of sex hormones will, the differences are apparent. There are a lot species in which case sex chromosomes are incredibly weird, hell Platypuses have some incredibly bizarre set ups and New Mexico Whiptail lizards lack a Y chromosome all together (Huzzah for lesbian lizards!). Alternatively, look at species with reversed sexual dimorphic patterns, most notably the Anglerfish if you want an extreme and a less extreme is Spotted Hyenas. Even then, Chromosomes aren't the sole deciding factor in something such as gonads, as folks with XY or XX can be born with plenty of conditions that would put them underd the medical label of "Intersex" (Roughly 1 in 1000 people fall under this definition according to http://www.isna.org/faq/frequency ). Women are less muscular due to the body producing less testosterone than a man would, however this isn't uniform (Or even average I'd wager) across all women neither is it uniform across all men. For in game examples, look at the any of the beast tribes or the Lalafell, in which sex chromosomes don't seem nearly as massive of an effect of their general structure.
Without getting too in depth into the bone structure of the Lalafell, it doesn't seem like male lalafell have that different of body structure than a female one does. Plus again, the size of their hips is hardly a deciding factor in what their armor looks like. The point is, look at the general body structure of a Roegadyn women. Look at the body structure of a Midlander, Elezen, or Au Ra man. Note how similar they actually look, poses aside? Looking at just their body structure, they're incredibly similar, so why the differences in armor? Considering we don't know exactly how Roegadyn or Lalafell body structure works your assumptions work akin to mine do. For all we know, Roegadyn newborns are incredibly small and develop outside the body so a difference hip structure isn't needed.
No, it does a wonderful job to stay away from that.. Most of the time. Nothing is perfect and we can strive to be better, armor and character wise as well. Minfillia really isn't helping your case by the way, she's like the epitome of damsel in distress :P Armor that shows the belly exists for little purpose other than to show off the stomach. I don't complain about the leather harness sets and subligars because they're the same on men and women (Excluding the bra on the women because well game ratings). The DRG AF is not however. Plus, go ahead and talk about the bunny GS set or the new dancer esque set in that thread where the OP is asking for male versions. The game is lacking on a few fronts.
Excuse me for thinking critically about the media I consume? I'm sure a lot of people find belly's attractive.. Look at the advent of female belly dancers and all that advocacy for a smooth (Not toned!) stomach. If I see a girl with a large spear coming at me with a giant bellyhole, you know what I'm going to do? Go "Huh, well time to jam something sharp in that huge opening in her armor!" then laugh as she allowed for such a silly opening in her armor to exist.
Fighting styles being different isn't a good explanation, others have already said why. Keep listing reason if you'd like.