Hips are deceptive and usually lend more volume than one would expect but, if underfunded there too, then the issue mostly becomes one of chest wall dimension (height/width/circumference/so forth) than cup size......specifically, small flaps have small dimensions and the body lift accounts for this to avoid leaving empty spots in the periphery of the breast by staggering the way the flaps are layered so that there is fullness in the "base dimension" of the breast pocket. Beyond that, shaping a small flap is a challenge, if it doesn't fill out the periphery it won't be good no matter how skilled they are.......even adding an implant beneath a flap that is too narrow or only covers part of the chest under the breast skin won't do it.
If the flap has proper dimension, an implant beneath it can be a big help.
No, no one has been willing to try the BodyLift Flap outside our group and they're typically astounded that it is possible.
Glad to help, its what I'm here for!