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

Please read the description.

outfit1
1girl, solo, short hair, red hair, short twintails, double bun, ahoge, hair ornament, purple eyes, school uniform, neck ribbon, white shirt, pinafore dress, short sleeves

other hairstyle appearance (not perfect)
1girl, solo, red hair, low twintails, ahoge, hair ornament, purple eyes

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

Due to the small number of images in the dataset, the character's clothing or pose may not be fully realized.