Final Fantasy XIV director and producer Naoki Yoshida announced a crossover with Final Fantasy XVI yesterday, but something even bigger may come at some point.
During a press conference at Final Fantasy XIV Fan Festival in London, which TechRaptor attended, we asked whether we may get outfits beyond just Clive's as part of the collaboration.
For context, below you can read the question in full.

Thank you for taking the time in your busy schedule to ask Final Fantasy XVI Producer Naoki Yoshida about the collaboration. With all the traveling, it must have been difficult to coordinate.
We saw the Torgals and they're very cute, and Clive's outfit also looks great, but will we have any chance to get outfits portraying other characters like Jill, Benedikta, or Cid as well? As you may know, glamours are the true endgame.
Yoshida-san's answer was perhaps unexpected but definitely interesting. And yes, if you're wondering, there's a running joke going on since PAX East in March.
Yes. The producer of Final Fantasy XVI is a very busy person, but I managed to get some time to talk to him and I was able to get his approval for this collaboration.
In terms of whether you can expect gear from characters other than Clive, well, we're still working on the PC version, and I think there are quite a few people who maybe just bought a PS5 and haven't played XVI yet, so for any elements that are further in the game or such, we don't have plans on introducing it yet.
For now, I hope you can make do with Torgal and Clive's outfit, and if I manage to get some time to talk to the Final Fantasy XVI producer again, then I can pitch the idea of doing a bit more of a grander crossover.
Speaking of collaborations, during the same press conference, Yoshida-san mentioned that he would really like a Diablo crossover, since he's a big Blizzard fan, albeit he's not sure it'd be easy to do justice to the franchise due to Final Fantasy XIV's T rating.
He wouldn't want to disappoint the fans and if he portrayed some sort of "softer Diablo" it probably wouldn't be what people want. Yet, if it was possible to make it work, he would be "so happy" to see it happen.
While it's not formally announced yet, Square Enix has been in talks with Level-5 to bring back the Yo-Kai Watch collaboration.
On the other hand, if there is a demand for the return of the Final Fantasy XV crossover, as long as players let Square Enix know, they would see what kind of timing would work and would definitely consider it. The same goes for any time-limited content from the past.
Yoshida-san believes that this kind of collaboration generates hype and benefits the whole gaming industry.
At Final Fantasy XIV's fanfest in London, Square Enix revealed more information about the expansion Dawntrail, including the new "Viper" job, and showcased the upcoming graphical overhaul.
We also got the timing of the Xbox beta and finally got a rather final answer on whether Hironobu Sakaguchi would like to work on the game as a guest creator.