It doesn't work. I don't know if any other methods work. I WB Montreal didn't create a code for us to find so we could unlock the skins much earlier, I will send a complaint. The solution they use is stupid. I don't want to use the skins on a difficulty that just frustrates me. I want to use them through the story on normal difficulty where I both get a challenge, but still feel superior.

Sorry, I tried. :(

First of, I'm not 100% sure, but I think the costume code from Arkham City works within every versions of Batman Arkham Origins. I tested the code and got the confirmation sound, but I don't have the possibility to test it. Pirate version, guilty as charged. But I am buying the full version tomorrow with Season Pass.

The code is the following.

Left, Left, Down, Down, Left, Left, Right, Up, Up, Down.

This should open up the alternative Batsuits. You still need to have them purchased as DLC. The code however should bypass the need to finish the game on any difficulty so you can play them upon completion or through the New Game+. I will test it tomorrow to confirm my suspicions.