During the Final Fantasy XIV Letter from the Producer Live XC (90), Director and Producer Naoki Yoshida announced there will be a Fantasian Neo Dimension cosmetic crossover in FFXIV. This will appear on December 16, 2025.
The FFXIV Fantasian Neo Dimension items will consist of three outfit sets. These will be sold in the Final Fantasy XIV Online Store, which means you will need to spend real money in order to get them. Prices weren’t shared yet. The three clothing sets will be based on the costumes the leads Leo, Cheryl, and Kina will all wear in the game. No weapons are included.
Here’s the slide from the presentation showing the announcement:

While Hironobu Sakaguchi and Mistwalker first released Fantasian on Apple Arcade in two parts, it’s because of Naoki Yoshida and Square Enix that it also appeared on other platforms. The final version of the updated release also included in-game music options from titles like FFXIV Dawntrail and Endwalker.
Here’s the full FFXIV Letter from the Producer Live XC:
Final Fantasy XIV is available for the PS4, PS5, Xbox Series X, and PC, and the Fantasian Neo Dimension items will be available to buy and wear in-game on December 16, 2025. Fantasian first appeared on Apple Arcade, but later appeared in its updated form on the Switch, PS4, PS5, Xbox Series X, and PC.