The default costume of Nijisanji's Asahina Akane, as seen in post #4040981.
She is portrayed wearing the same Selene Girls school uniform much like her gen-mates, but set in red instead of blue: a black collared shirt, red plaid bow, white jacket, red armband, a black pleated skirt with white fringe, black thighhighs with red lines, brown loafers, and an argyle cardigan.
This tag implicates asahina_akane_(nijisanji) (learn more).