静凛(騎士)
The fifteenth [[official alternate costume|costume]] of [[Nijisanji]]'s [[Shizuka Rin]], as seen in post #7187439. 

It is a fantasy [[knight]] costume, and unlike most of her outfits that were done by her designer [[Takehana Note]], this one was designed by [[momoko (momopoco)|Momoco Haru]].
shizuka rin (15th costume)