I want to alter my body shape, possibly through a BBL. Is it fat, or my rib cage?

Thank you for your photos. I think you have an issue with a wide chest that cannot be solved with surgery. You do have some fat of your abdomen that can be easily liposuction. This modest amount of fat can be added to your hips to slightly improve their fullness. From the side your body contour looks very good. I would seek out board-certified plastic surgeons that have a good amount of experience with fat grafting to the hips and buttocks Good luck.Earl Stephenson Jr. MD D.D.S. FACS

Essentially, you could liposuction the fat from the abdomen, sides and back to make your waist smaller.  The fat could then be reinjected into your hips to give you the shape you want.Find a board certified plastic surgeon who performs hundreds of Brazilian buttlifts and
liposuction procedures each year. Look for great reviews and great
before
and after pictures.Kenneth Hughes, MDLos Angeles, CA

Thank you for your question.The BBL procedure involves harvest fat from areas of your body where there is excess fat and injecting that fat carefully into the central zone of your buttock. In addition, it involves liposculpting the buttock to facilitate a more rounded look. The common donor sites for this procedure is your posterior waist/flanks, lateral thighs, back, waist, and anterior tummy. Please visit with a board certified plastic surgeon