It is a slider lora negative values are for "skinny" and plus values are for "voluptous". Works best between -2/+2 but don't hesitate to experiment. Trained with Albedo XL V21 but should work well with other SDXL models. Negative values desaturate and positive values higher than 2 saturates the model. I am using Sliders to train these If you have any suggestion to prevent saturation change I am more than happy to hear.