The Hisuian Growlithe Kimono Set will be gifted to those who preorder Pokémon Legends: Arceus. You can receive it by choosing Get via Internet from the Mystery Gifts feature in your game, up until 9 May 2022. Then you can dress yourself up in this fashionable getup as you enjoy your adventures in the Hisui region!
It takes approximately two hours of play time before the Mystery Gifts feature is unlocked. You will need an internet connection to claim this preorder bonus, but you will not need a paid Nintendo Switch Online membership.