Because there's more fabric in the rise of high-waisted pants, they create the impression that your lower body, and especially your legs, are longer. On the other hand, low-rise pants make your upper body appear longer because your pants only start at your hips.
What's the point of high-waisted pants?
High-rise denim brings some benefits—they help reduce the appearance of any bulging at the waistband because they sit higher on the torso than low-rise jeans.
Why is high-waisted so popular?
They not only highlight hips and butts — they demand them.” The mainstreaming of the high waist has been a balm for many women who never wish to go back to a time when one was constantly at risk for exposing their ass crack.