相羽ういは(通常)
The default costume of [[Nijisanji]]'s [[Aiba Uiha]], as seen in post #3581607.

It is an [[idol clothes|idol costume]] consisting of a [[double-breasted]] [[white dress]] top with [[puffy short sleeves]] and a blue [[feathers|feather]] accessory, a [[blue shirt]] underneath with a matching [[ascot]], a [[frilled skirt|frilled]] [[blue skirt]] with a [[blue flower]], blue [[kneehighs]], [[white footwear|white shoes]], [[white gloves]], and blue [[hair bow]]s.
aiba uiha (1st costume)