Ushio Kofune from Summer Time Rendering (SummerTime Render) trained on 54 SFW and NSFW images.
Use kofune ushio to generate Ushio. This was a really easy "outfit" to train so you only need 2 extra prompts:
uswimsuit
shell necklace
Both of these can be used together or separately, depending on what you want to generate.