Gives the subject a speedo tan line white butt in contrast with tan legs and torso. Although this can sometimes be prompted by some models without a LoRA, this make is much easier, just use 'speedo tan line' and it should work. You may need to say they are naked, or mention bare ass, have their back to the camera, or something similar.
I captioned it gender neutral, but all the training images were of men.
Adjust the strength depending on whether it is used with other LoRA, and if you want a less pronounced tan line, lower the strength, but also prompting can help with that aspect as well.
Available for:
Qwen Image 2512 or Qwen Image Edit 2511 (same lora)
Z Image Turbo
Z Image Base
Flux.2 Klein 9B
You can edit with the Klein 9B model or Qwen Image Edit 2509/2511 workflows to add speedo tan lines
Fun fact: The Z Image Turbo version was the first LoRA that I ever shared on here.
Description
Tested with Qwen Image Edit 2511 and Qwen Image 2512 text to image workflows or image edit to give someone a speedo tan line that doesn't have one, or for someone who is in underwear. See my sample prompts.