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

Please read the description.

outfit1
aacoco, long hair, blonde hair, blunt bangs, choker, frills, yellow dress, sleeveless, yellow gloves, yellow skirt


outfit2
aacoco, long hair, blonde hair, blunt bangs, earrings, mermaid, armlet, yellow bikini, shell bikini, bikini top only, bracelet

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