Ushiwakamaru from Fate Grand Order
DISCLAIMER:
Just to clarify, you DON't NEED to post all this stuff in the prompt to get the character. All of these tags is only if you aim for a more or less accurate depiction of the costume. And I say "more or less" because forget the AI I myself can barely tell ascensions apart.
Something around the lines of "revealing clothes, detached sleeves, black sleeves" is more than enough for basic gens.
ILLUSTRIOUS
Base: black hair, very long hair, blue eyes, hair bun, side ponytail, circlet, hair ornament, head wings, feathers, hat
Ascension 2: revealing clothes, detached collar, japanese clothes, japanese armor, underboob, sideboob, detached sleeves, asymmetrical clothes, asymmetrical sleeves, white sleeves, purple sleeves, blue panties, chaps, asymmetrical legwear
Ascension 3: revealing clothes, detached collar, japanese clothes, japanese armor, underboob, sideboob, detached sleeves, black sleeves, red panties, chaps, pauldrons
Corrupted: Ascension 4 + "dark skin, body markings, red eyes"
Swimsuit 1: black hair, very long hair, blue eyes, hair bun, side ponytail, blue bikini, cropped jacket, off shoulder
Swimsuit 2: black hair, very long hair, blue eyes, hair bun, side ponytail, red bikini top, white bikini bottom
Swimsuit 3: black hair, hair ring, very long hair, blue eyes, hair bun, side ponytail, tengu mask, red one-piece swimsuit, japanese clothes, black coat, short sleeves
PONY
Notable tags: black hair, very long hair, blue eyes, hair bun, side ponytail, circlet, hair ornament, head wings, feathers, hat, revealing clothes, detached collar, japanese clothes, japanese armor, underboob, sideboob, detached sleeves, asymmetrical clothes, asymmetrical sleeves, blue panties, chaps, platform footwear