About the LoRA, her appearance is:
arinsu, 1girl, pink skin, pointy ears, white hair, hair slicked up, blue-grey eyes, red eyeliner, black lips, asymmetrical bangs, black nails, long hair
Use anime screencap to get her looking like in the anime.
The outfit is:
purple layered dress, strapless dress, front slit, two-sided cape, red cape, black cape, pink bridal gauntlets, red sash, purple brooch, gold neck ring, grey long skirt, elbow gloves, white boots, high heels
Use clothing cutout for the cutout under the cleavage, but it might not work, or you might not need it.