ミユ・オッタフィア(通常) ミユ・オッタフィア(部屋着)
The default costume of [[Nijisanji ID]]'s [[Miyu Ottavia]], as seen in post #3847685.

It's based on an [[otter costume]] with an [[animal hood|otter hood]] top and a [[fake tail|false otter tail]], and [[black footwear|black]] [[boots]].
miyu ottavia (1st costume)