Following the release of Final Fantasy XIII-2, Square Enix created many different types of downloadable content to expand the experience. At first, this focussed on cosmetic changes, but it didn't remain the case for long.
Some of costumes were tied in with other game franchises such as Assassin's Creed and Mass Effect, but there were also other types of DLC in the form of Coliseum battles and extra story episodes.
Speaking at an open forum relating to Lightning Returns: Final Fantasy XIII, the game's executive producer Yoshinori Kitase spoke about lessons they've learnt from the release of the different costume packs:
"The feedback on the DLC really showed us that fans wanted to make cosmetic changes such as costumes actually have an effect on your character."
However, he also spoke about how the rest of the DLC wasn't received anywhere near as well - even referencing the disappointment players felt when they played the different story episodes:
"Outside of the outfits DLC, fans didn't buy the others as much compared to costumes. Costumes like the black and white mage were quite popular with fans. Also not ending the story with the episodes really disappointed players."
It will be interesting to see what kind of approach Square Enix will take with Lightning Returns: Final Fantasy XIII. They will clearly want to add additional costumes, but their take on story-based DLC could change considerably.