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A few of the cross-over events have repeated, so theres a chance. The 2, 7, 8 and 9 outfits(so wild rose, strife, lionheart and tantalus respectively) are actually tied to the veteran rewards system, so youll get those just for playing. Others(like tidus and yuna from 10) were originally rewards for attending fan fests, and have since been added to the cash shop. So a lot of these outfits can still be had for sure.
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Since you last posted they repeated the Iroha 11 crossover and the dragon quest crossover(and the yokai, which is still ongoing). So you missed one nice looking outfit, a couple goofy DQ hats, and a brickman mini. Lightning and Noctis havent come back so far(nor has the original 11 crossover that i half remember reading about).