[[Nini Yuuna]]'s 6th costume, as seen on the left half of post #6303780.

This outfit is a sleepwear ensemble consisting of a [[two-tone hoodie|two-tone]] [[white hoodie|white]] and [[red hoodie]] with a [[penguin hood]] over a [[pink shirt]], and a pair of [[black thighhighs]] with penguin-themed [[slippers]].
nini yuuna (6th costume)