Also known as: アルトリア・オルタ(水着), メイド・オルタ, メイドオルタ
Saber Alter in her Swimsuit Rider Second Ascension swimsuit from Fate/Grand Order. She wears a black bikini and a black hoodie, but the rest of her garments are standard maid-themed articles such as a maid headdress, a frilled choker with a black bow, a white apron over a black skirt, a white frilled thighlet on her right leg, black thighhighs, and black shoes. Instead of a sword, she uses a mop as her close-range weapon.
While the two look similar she actually wears a different bikini in her final ascension; note the white straps.