Prompting for "slim waist", "narrow waist", etc. will only take you this far. This Lora will take it farther, much farther... until you'll beg it to stop. Does a pretty good job of maintaining "natural" curves and leaving the rest of the image intact.Somewhere between strength 0.5-1.0 the results become anatomically implausible. By 2.0 you're deep into Toontown. Also, at higher strengths exposed midriffs will become toned (not jacked) and plasticky - nature of the dataset. Negative strength adds chub, not flub - Might be useful in it's own way!

Lithe (Waist Slider for MOSS, Krea 2, Z-image)

This one is much more reliable than the ZIT-trained Lora, and generations remain stable at higher strengths even compared to the Krea one.

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