Typically, with a traditional tummy tuck, the main goal of the procedure is to provide you with a flat abdomen. The excess skin on the tummy is removed and the muscles of the abdominal wall are tightened, so essentially you will have a flat abdomen, but no shape.
If you have had a traditional tummy tuck and would like to have a better shape, an hourglass tummy tuck is the solution for you. In this procedure, liposuction is performed on the back, abdomen, and flanks. The excess skin is removed and fat is transferred to both hips to correct your square shape.
Now, the only drawback of this procedure is that because a lot of the excess skin was removed during your first surgery, there is not going to be enough skin to place your scar low in the bikini line. One way to get around this is to modify the technique by essentially cutting the excess skin, pulling the flap down, closing the area where the previous bellybutton was, and then recreating a new bellybutton. You will have a vertical scar approximately a centimeter and a half long below the bellybutton.