Hikari was the one who changed the least among the group most likely. Even though many had encouraged here to change her regal dragon princess attire to something casual, Hikari was not comfortable in anything else.
Mind you, Hikari was Hikari, she looked absolutely amazing in whatever the wives threw on her, enough so that Draco locked himself and Hikari in a separate spacetime for a week, where he defiled all her holes throughout that entire period in both human and dragon form.
When Draco returned her, even the power white dragon with insane defense and regeneration was breathing weakly, her eyes blurred and her tongue lolling out. She had to recover for a month before she could move again.
Eventually, the wives decided to let Hikari stay in her princess attire since it invoked a sense of propriety and would keep Draco at bay on most days, otherwise poor Hikari might be defiled to death by this beast.
「Name: Hikari – True God