kaida haru (1st costume)
The default costume of Nijisanji's Kaida Haru, as seen in Danbooru post #3849397 and Danbooru post #6288319.
His default costume consists of a semi-traditional Japanese garb of a white checkered kimono top, black hakama, grey collared shirt under the kimono, black gradient haori, a gold-trimmed maroon obi, earrings, and black leather shoes.