weight 0.7 is best.
I created this LoRA as requested.

Please read the description.

outfit1
nico robin, long hair, black hair, hair slicked back, eyewear on head, sunglasses, blue eyes, collarbone, cleavage, blue jacket, cropped jacket, partially unzipped, short sleeves, midriff, sarong, print sarong


outfit2
nico robin, long hair, black hair, bucket hat, white headwear, eyewear on headwear, sunglasses, forehead, blue eyes, collarbone, bare shoulders, cleavage, blue dress, short dress, sleeveless


outfit3 (not perfect) (not perfect) (not perfect) (not perfect) (not perfect)
nico robin, long hair, black hair, bangs, blue eyes, cleavage, black dress, black jacket, long sleeves, partially unzipped, black thighhighs

I uploaded a sample image of the outfit as a post.