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

Please read the description.

outfit1
ichinose shiki, idolmaster, long hair, ahoge, medium breasts, red bowtie, plaid bowtie, white shirt, cardigan, navel, black skirt, pleated skirt

outfit2
ichinose shiki, idolmaster, long hair, two side up, hair bow, ahoge, medium breasts, earrings, bare shoulders, frills, red dress, elbow gloves, black gloves

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

By and large, it works well no matter what outfit prompt you enter.
Since there are so many different types of idol outfits, I just mixed them all together.