You might be thinking of something else, perhaps:
* The Angelus outfit: This outfit has feathery wings and is available in the game's "Dress-Up" feature. You can obtain it by talking to the "Dress-Up Lady" in the town of Trodain.
* The "Skyward" ability: This ability allows the player to jump great distances and appears similar to flying. It can be learned by a character who equips the "Winged Cap" accessory, which can be obtained by clearing the "Trial of Wings" challenge in the "Dark Cave" dungeon.
If you're looking for something else entirely, please provide more details! I'd be happy to help you find what you're looking for.