After finishing the game, you get two suits that gaves you 25% more resistance to any hit and if you have an old Dead Space save file you get the original Plasma Cutter wich cost 0 credits and can be found on any store at any time.

Unlockable	How to unlock
Arctic Security Suit	Complete the game under the Zealot difficulty to unlock it at the store.
Dead Space 1 Plasma Cutter	Have an Dead space 1 Save File.
Elite Advanced Suit	Find the schematic in New Game + mode during Chapter 11. When the yellow lift reaches the top, turn around to find it on the ledge between the elevator and wall.
Elite Engenier Suit	Found the schematic before entering the vacum on chapter one and purchase the suit on the store in the New game+ mode.
Elite Riot Suit	Purchase at the store in New Game + mode or log into the same EA account in the iPod/iPhone Dead Space game.
Elite Security Suit	Find the schematic in New Game + mode during Chapter 9. After you exit the tram, search over the railing.
Elite Vintage Suit	Find the schematic in New Game + mode during Chapter 6. Search the area where you fight the tank before the end of the chapter.
Hacker Suit	Have a saved game file from Dead Space: Ignition to unlock it at the store.
Soldier Suit	Complete the game under the Hardcore difficulty to unlock it at the store.