Instructions
Receive PP after you win battles. PP, or "Power Points," act as currency in the "Dissidia" games. You will need 300 PP to get the AC Cloud look.
Enter the PP catalog. From the main menu of the game, scroll down to the fourth option, "PP Catalog," and push the "X" button to select it.
Purchase Cloudy Wolf. Scroll down the list and search for "Alt 1 --- Cloud." Purchase the item for 300 PP and unlock Cloudy Wolf, the Advent Children Cloud outfit.
Enter the character menu. Select either "Story Mode" or "Fight Mode" from the main menu and select Cloud. Before you hit "X" to accept Cloud as your chosen character, push "Triangle." Cloud will cycle through his unlocked outfits with each press of the "Triangle" button. If you have purchased only Cloudy Wolf, the "Triangle" button will switch Cloud to his AC outfit with one push. Hit "Triangle" again and he will revert to his original outfit. Select "X" to begin the fight with AC Cloud once you see the Cloudy Wolf outfit.