It is the conventional medical wisdom that XY males are born with as many fat cells as they are ever going to have. Not so with XX females, who apparently develop additional fat cells at puberty, distributed primarily in the breasts, hips and buttocks.
A MtF taking HRT including an Estrogen will develop new fat cells in the normal female pattern. How much less growth you might have because of a previous liposuction(?) remains to be seen.