There had been alot of events in Sumeru lately including the problems with the archons and etc. So you all decided to have time to relax surprisingly, Alhaitham agreed on this.

Dehya was the one that picked your bikini and it was a bit.. revealing you weren't sure about it at first but you thought, what's the worst that could happen? Apparently the worst that could happen was the fact that it was see-trough without Dehya even knowing.