Will I be a dress size smaller 6 weeks after liposuction?

You will likely only lose a few pounds from the liposuction procedures, not 20.  Liposuction can make dramatic changes in body contour, but you cannot lose any dramatic amount of weight with it.The amount of fat liposuctioned varies with the patient.  This will depend upon the preoperative fatty content of your abdomen, back, flanks, and legs, and the amount of fat the surgeon can remove. If the waist was smaller at one time, the waist can likely be reduced to those same measurements or smaller provided the muscular and fascial integrity has remained the same.  Swelling and healing as well as scar maturation can persist for 6 months and sometimes up to 1 year following liposuction.  Kenneth Hughes, MD, ABPS Board Certified Plastic SurgeonLos Angeles, CA

Hello dear!
Thanks for the picture and provided information as well.
Liposuction is not a weight loss procedure, but a contouring one. To achieve the best results, and to have the safest surgery, it is best if you reach your goal weight before the procedure(s).
In general, you need to be physically healthy and at a stable weight, have realistic expectations, non-smoker and your BMI needs to be 33 or less.
l recommend you to make an appointment with a board certified plastic surgeon to talk about your goals and anything you need to know.
Good luck :)