Dunno, Bylass' regular outfit is pretty "obscene", might actually rule it as more since Sothis' outfit has the ornate ancient culture thing going for it.

Rewording the gist of what a redditor said, "I can't take seriously any scene Bylass is in because when you plop her next to all the other characters she looks generally outta place for the setting or like Edelgard's slutty girlfriend."