Thank you for your question. I get this question a lot. The idea behind a tummy tuck is to remove the loose and excess skin. Most of the time there is abdominal wall tightening that helps flatten the abdomen as well. If liposuction is also used at the waist, the waist size can indeed get smaller and this may allow you to wear a smaller t-shirt size. Jeans are worn around your hips and most of the time the work of a tummy tuck is done above the level of the hips and therefore I don't expect jean size to go down. However, if you tuck the extra skin into your jeans versus wear the skin on the outside of your jeans, then removal of the excess skin can indeed make your jean size go down. I agree it is rather confusing but this can easily be addressed at your consult. I hope this helps.