Okita Souji Alter Swimsuit Saber in her First Ascension swimsuit, seen alongside Rengoku's First Ascension outfit. Okita's hair is extremely long, and she wears a white bikini, an orange scarf, a black shrug, a red rope tied around her right leg, and black high platform sandals.
This tag implicates okita_souji_alter_(swimsuit_saber)_(fate) (learn more).