 You can unlock special costumes if you do the following. Start the  game in Normal Mode with any characters, dont pick up any items  until you reach the Police Station courtyard. Go to the underground  passage way to fight the zombie Brad Vickers, then you get the  Locker Key from his corpse. Brad Vickers will only appear if you do  not pick up anything before you reach here. Use the key to unlock  the cabinet in Dark Room. You get new costumes and weapons for Leon  and Claire.