I used WAI-NSFW-illustrious-SDXL v10 checkpoint for the sample images.
Trigger word: g4y30n
General Appearance Tags: 1girl, two-tone hair, purple hair, black hair, purple eyes, black nails,
Outfit: g4y30ndress, black dress, purple jacket, bare shoulders, high heels,
You might have to put cleavage in negative prompt if you want her accurate default look.
You can also try this description for her "swimwear" look in that one chapter, but I don't think it got trained very well as there were only a couple image references for it:
g4y30nswim, swimsuit, white bikini, swimsuit cover-up, cleavage,