Square Enix is extending their DLC to Bravely Default: Flying Fairy, which will have additional character specific equipment. Some extra content will be bundled with the game’s music CDs.
If you purchase the single "Linked Horizon" you’ll get a Noble Composer outfit for Lingabel.
The official Bravely Default soundtrack includes a code to use the Freelancer outfits for all four heroes even if they have a different job.
These costumes will be available to everyone after December 13 if you reach a certain point in the game.
Agnes also has a Orthodox Knight costume, which you can unlock using a product code bundled with Bravely Default: Flying Fairy.
It’s unclear how (or if?) you can get the Orthodox Knight costume if you get a used copy of Bravely Default. Bravely Default: Flying Fairy comes out for Nintendo 3DS on October 11.