it's not a costume, it's the Syrabanic Marine motif like the comment above yours from November 2022 said.
miaow! i'm Luna ( she/her ).
🌸*throws cherry blossom on you*🌸 "Eagles advance, traveler! And may the Green watch and keep you."
🦬🦌🐰 PlayStation and PC EU.
LunaLolaBlossom on psn.
LunaFloraBlossom on pc.