Florence Nightingale in her yukata from the Anniversary Heroines Craft Essence. Her yukata is red and has the symbol for the E Pluribus Unum Singularity print on it in yellow.
Original CE: post #2433510
Artists: Konoe Ototsugu, Takahashi Keitarou, Takeuchi Takashi, and Wada Arco
This tag implicates florence_nightingale_(fate) (learn more).