Upon purchasing this DLC, you can claim these Holo-X and Holo-Y in-game apparel items and wear them even during your journey through the main game. Once you unlock the ability to adjust your character’s looks and outfit—about an hour into the main story—you can claim these apparel items by pressing the X Button to open the main menu, and then pressing the − Button to access the Outfit & Looks menu.

More details on the official game page of Holo-X and Holo-Y Apparel Items ...