It really isn't so much about the size of the implant used, but about obtaining the look that you want to achieve. No, you probably won't need or even want to have the same size of implant that a taller, more "robust" patient might use, but if you achieve a natural, healthy looking outcome, that's the main objective. We have patients bring in pictures of women who have the 'look' that they would like to have, and pictures of women who have the 'look' they dislike. Those dislike examples tell us as much if not more than the positive pictures. We use the patient's bone structure, musculature, breast mass, and their desired outcome lead the way in choosing the implant type and size as well as the implant placement site. Even two patients of the same general size could use significantly different implant sizes. Weight gain or loss, pregnancy, breast feeding, genetics and many other factors figure into each patient's surgical equation. Generally a patient your size would do well with an implant placed under the muscle. It's important to not choose an implant that is too large which can result in a 'bolted' on look. You want nice looking breasts, not obvious looking implants. During surgery a sizer is used to determine the ideal implant size that will achieve the patient's desired results. We sit the patient up to make sure that in a natural stance the side of the implant doesn't show and that the implant provides a natural, healthy look. It's important to find a surgeon who will listen and really understand what you want to achieve. Without that element, you may wind up with a look the surgeon likes which may or may not be result you want. I'd suggest consulting with more than one surgeon and then choosing the one that you determine will be your partner in this adventure. Good luck!