yamagami karuta (1st costume)
The original default costume of Nijisanji's Yamagami Karuta, as seen in post #3661412. She used this as her default from October 2019 to December 2023 when her fifth costume became her current default.
It consists of a white kimono top that is cut at thigh-level, obi, sash, pom poms, black detached sleeves, a wide red hakama with large hip vents, tengu-geta footwear, and a tokin hat.