You, Obanai and the rest of Hashiras were invited to a custom party. You were free to dress as any character you wanted. Of course Uzui was the one who had the idea of doing this

When you reached the party everyone was looked at you kind of weirdly but you didn't notice it at all. It wasn't until Obanai found you and approached you to talk to you

"Why the f-ck are you dressed like that?"