Your sentiment is warranted, everyone should be able to wear whatever they want, regardless of gender. But we do have to take into account that these items do take time to impliment. We also have to take into account that when anyone, designs outfits or uniform for each gender, the go to is usually a suit for males and a dress for females, since that is the easiest differentiation method we have. The stick figures on bathrooms could easily be reversed, but they are too engrained in our minds otherwise.
However, one thing you said is a bit counterintuitive to the current situation, though I don't think you meant it that way.
This statement is or was actually how the devs initially viewed the glamours they created. They'd make an outfit for males and think it would look good on females so unlocked it. However, they would not do the same with the sets made for females, they left those gender-locked. This is what created that divide and spiraled to a head with the Bunny Suit and Thavnairian outfits. Gender locking isn't good, but as long as an equality is maintained, one set male one female, the heart of the issue is pacified.Men do need some better glams, but it doesn't hurt for women to be able to wear them, as well.
The rewards for this event are "fair" at least in regards to maintaining base equality. Glamours for retainers aside, which SE has addressed.
I do however have a question, that I feel might show how arbitrary this topic is for the current event.
This isn't the first time we've had gender-locked event rewards. And by that I mean the items are seperate, not that they have a different look but are the same item. we've gotten them before in the following events:
Valentine's Day - the male and female aprons. The male version just being a reskin of the culinarian's level 50 outfit. The female version was a complete origional.
Little Ladies Day - the Songbird and Senechal attire, and the Lady and Lord's Suikan, as well as their respective clogs. The Songbird and Senechal outfits are again a "dress" and a "suit" on equal footing, and the Suikan's are very similar too, hemp length being different though. The only major difference being the socks on the female clogs.
Moonfire Faire - various swimsuits and yukatas, all of which are on equal footing with another compared to real world attire. Males even get flat wood clogs and females sockless ones. But at the same time, why can't males get a one-piece swim suit and females a more sporty look with shirts and a crop top?
All Saint's Wake - the Werewolf outfits are unique with the female outfit being "cuter" and getting a skirt again? Why does a werewolf need a skirt. Why can't males be cute? Also of special mention is the Witch's attire which while one item, is a whole outfit on females compared to males since females have the skirt attached.
The Garo Event also had unique outfits for some of the female jobs, that arguably were better than the male versions.
So it's not like any of this is new. And in most cases the same rules applied, you could only receive the one for your gender, but maybe get the other gendered one later, through either the event or the Calamity Salvager. So why the uproar now. In all of the previous instances the gear was fair, something equally nice for males and females, but no one ever really complained, at least not to this much of a degree.
Honestly, I really do think it's a case of the female outfit being really disliked among the people who play female characters. And because they dislike it people are clamoring for the unlock, probably because the male version is similarly themed but less busy. I'm not saying gender-locking is good, or that things shouldn't be unlocked, but I dont think this outfit is the proper platform to hard press the issue on. I think people just don't like the female version and don't wanna just say that and move on. Honestly, how often do you wear the other event specific items, that usually have specific themes that people might not wanna wear on a daily basis.
Not every piece of gear will be for everyone, bit that doesnt mean the devs are being unfair.