This is a common question asked not only in forums, but also in the offices of cosmetic plastic surgeons. It seems to be a source of some angst for most women as they have tremendous concern for what the final outcome might be. I find that several things over the last 25 years have helped patients decide which type, shape, and projection ratios will best suit their needs. I think it's helpful if the patient brings in several photographs of what the goal look of her breasts might be. Also, if she can bring some photographs of what she doesn't want this will eliminate trying to express in words what “natural”, “high cleavage”, “low cleavage”, “fake”, and “stripper” may mean to her. I have likewise found the Vectra 3-D imaging platform to be the single most helpful tool in trying to visualize what the outcome might be with different sizes of implants. The Mentor shell sizing system,in which a shell of implant material is placed over the breast and in a padless bra, can likewise be helpful in that it can, not only show the size in a bra, but can give the patient some idea as to what the weight of the implant might be.Placing a real implant over your breast, will always look larger than when under the muscle. In my opinion, the implants will look best when the base width of the implant is at, or just slightly less, than a natural base width of her breast. Considerations of chest wall abnormalities, location of breast creases, shapes of the breast, amount of overlying breast tissue, stretch ability of the skin and breast over the implant among other things also play a role in trying to best decide which implant will look best. It can also be helpful if the plastic surgeon, during their consultation, can provide some insight into what the likely outcome would be with different sized implants given their experience in breast implant surgery over many years. We ask our patients to bring different types of clothing such as evening gowns and bathing suits as well as a tight shirt to evaluate what the implant might look like under these type of clothing options. It is also possible to make a home made breast size or using grain rice. Approximately 1 ounce of rice equals 30 mL of breast implants volume. The rice can be placed into a pantyhose leg and enough volume left in the pantyhose such that the rice can be flattened out. You can then tie off the pantyhose and cut off the excess. This flattened rice volume pantyhose can be added on top of the breast inside of a padless bra and can give a rough approximation of what the corresponding implant might look like. Besides the size, most plastic surgical consultations for breast augmentation will also deal with the shape of implants, whether round or anatomically shaped. Here I think the Vectra really shines in that you can place two images next to each other, one with the shaped implant and one with a round implant such that the potential breast implant patient can really see what the difference would look like on them. All things considered, this can be a fun process and the vast majority of patients in my practice are quite happy with their end result. Hope your surgery goes well and good luck.