What some players are saying - and I agree with their sentiments - is that making everything unisex benefits everyone in the long run. Back when it was relevant my (male, if it matters) friend bitterly complained about the way the Noct Lorica looked on his female Miqo'te because the breastplate was too macho. Then there are the complaints from players with female Dragoons who have to wear their 'sexier' version of the cool job-specific armour; they want access to armour pieces which haven't been adapted to show as much skin as possible. In my friend's case, he would benefit from having access to more 'feminine' gear. In the case of the Dragoons, they want access to more 'masculine' gear. Both groups are using female characters yet they have diverse opinions about how they want their characters to dress.
As a result, I feel that it's important that all players have access to the same number of options so that when a specific piece of gear doesn't agree with them they have equal opportunities to change the way it looks. Most endgame equipment is presumably intended to be suitable for anyone (though it's not always adapted well; burly Astrologians got short-changed with their AF and its lack of detail when stretched over their larger frames) while nobody is going to be forced to wear a level 1 Thavnairian Bustier unless they go out of their way to have one crafted. Glamour items are never forced on anyone.
As nobody can agree on what exactly constitutes 'masculine' and 'feminine' even on an English-speaking forum used by a small percentage of the players of a single video game, I strongly believe that pushing for more unisex options so that each individual player can decide what suits their character is the best way forward, and unlocking the growing number of extra items female characters can use that males cannot. If it then turns out that Square-Enix's staff are currently struggling to make gear without designing it on petite females first and clumsily adjusting it for male characters as an afterthought, that's a separate creativity issue which needs to be addressed behind the scenes.
I think we need to be clear that having access to equal volumes of gear is our message first and foremost as the innate suitability of each piece of equipment for any given gender is in the eye of the beholder. The current knight-heavy Ishgard storyline lends itself to inspiring elaborate armour suitable for both of the game's genders so it's down to the designers to give that to us - once they stop going down the easy route of releasing sexy costumes for girls and ignoring male characters entirely.