Would a corset tummy tuck make my wide ribcage look smaller? (Photos)

Thank you for sharing your question.  A tummy tuck muscle repair will help to narrow the soft tissue waist of a patient if it has been stretched or separated over time, weight loss, or pregnancy.  This is the area between the rib cage and upper hip bone.  Otherwise the rib cage alone will not materially be impacted. 

Thank you for your questions and your pictures.  I think a tummy tuck with liposuction is the preferred treatment for you to achieve your goals.  You will have a flat abdomen with smaller waist and good abdominal contour.  Best of luck!