Female Ritsuka in her dress from the Fate/Grand Order Waltz In The MOONLIGHT/LOSTROOM game, released for Fate/Grand Order's 5th anniversary. She wears a White Dress with a grey portion around the cleavage, Black Gloves, Black Pantyhose, and black Shoes.
For Male Ritsuka's version, see Fujimaru Ritsuka (Male) (Waltz In The Moonlight/Lostroom).