The default costume of Nijisanji's Kaburaki Roco.
Her default attire consists of a black shirt and bike shorts underneath a second layer blue hoodie and a pouch bag, plus a blue coat. She also wears differently-colored socks (black on right leg and blue on her left), thigh straps on her left leg, and white sneakers.
This tag implicates kaburaki_roco (learn more).