A better way to expand veteran rewards or perhaps achievement rewards, or just obtainable sets in game, whatever the reason- It would be neat if we had more outfits from previous square soft/enix titles.
Outfits and hairstyles from pre-existing characters that would be nice to have in game: Garnet/Dagger, Ashelia, Zell Dincht, Seifer Almasy, Freya Crescent, Quistis Trepe, Sorceress Edea, Laguna, Lulu, Seymour, Rikku, X-2 dressphere outfits, Liltie + Yuke inspired outfits from Crystal Chronicles, Tifa, Aerith, Barrett, Aya Brea- maybe a Vagrant Story crossover event or something.
Also more outfits/hairstyles not mentioned! One specifically I'd love is Echidna's hair and Kaldea's hair from The Bouncer.