This isn't the first Western costume collaboration for Final Fantasy XIII-2. Assassin's Creed costumes have also been announced for the JRPG sequel.
According to Famitsu, the "N7 Armor" costumes will be available next week for 240 Microsoft Points ($3). While this announcement is for Japan only, it's likely to reach North America around the same time. Shacknews has reached out to Square Enix for confirmation.