Not necessarily. Many plastic surgeons recommend that Brazilian butt lift candidates be 20 to 30 pounds heavier than their ideal weight and above a size six in clothing to ensure that there is enough fat for harvesting through liposuction, especially since the removed fats will need to be purified before they are transferred. However, your exact weight and clothing size do not matter as long as your surgeon determines that you have enough total fat to make the procedure a success. If you lack sufficient fat at your initial consultation, your surgeon may recommend an alternative procedure, such as butt implants, or instruct you to gain weight before attempting butt lift surgery.
Many patients want to know how much fat actually survives. This is a very relevant question to ask, but it's also incredibly difficult to accurately answer. Most conservative estimates put the survival rate of transferred fat at roughly 50%, although many surgeons claim to be able to save a more significant amount. The fat that remains after 3 months of recovery will be your actual final result, not the results immediately after surgery.
Determine when in your schedule you could have your butt lift surgery, understanding that this procedure will require at least a week off of work. If you qualify and feel comfortable with your surgical plan, you may schedule your procedure at the end of your initial consultation, so you should be prepared, especially since plastic surgeons' schedules can fill up quickly.