If your waist trainer is tight on your hips and loose on your waist you likely have large hip structure or you're very hourglass. OR if the waist trainer is loose on your hips and tight on your waist you probably have a large rib cage. There is nothing we can do about your skeletal structure. Our Luxx Dolls sometimes hook the waist trainer on the last row towards their hips and on the first row closer to their waist  which can make it fit better - however we don't know if they can damage the waist trainer.