Please know that it is a common misconception that implant size correlates with the bra cup size. A bra-cup size itself requires many measurements to describe it. As you already know, bra sizes clearly vary among manufacturers, and they can label the cup size by any designation they choose. So a C will be a D for another. Additional factors, such as demi and full cup coverage, specific fabrics, padding, and elastics, can all affect the fit of a bra. Second, there is a confusion over sister sizers which complicates things. For example, a patient wearing a 34C may also fit into a 36B bra. Since you asked the question considering all things equal, then I think you might find it helpful to know that a study by Dr. Bengtson and Dr. Glicksman titled “Standardization of Bra Cup Measurements” has shown that the average implant volume required to increase the cup-size by 1 size is equal to 205 ccs. So a better thing to do would be to bring your desired bra to your consultation and do bra-sizing with different implants to see if the implant in addition to your breast tissue would adequately fill the bra. Even though you may give importance to cup size designation, what should matter most is that the implant looks good aesthetically and that the chosen bra fits and feels comfortable. With regards to implant size, please know that the implant has to fit YOUR body dimensions and it has to be tailored to your breast shape & anatomy. This requires an in-person breast exam. Surgeons use what is called tissue-based planning for optimal filling of the breasts. The planning takes into account the effects of implants on tissues over time, risks of excessive stretch, excessive thinning, visible or palpable implant edges, visible traction rippling, ptosis (Sagging), breast tissue wasting, and your general breast characteristics. To determine the implant size, breast measurements must be made: 1) Base Width of the existing breast tissue, 2) breast skin stretch, and 3) Nipple-to-Inframammary Fold distance. The combination of these measurements will help determine tissue coverage and the required implant volume to optimally fill the breasts. Then your preferences can be added to tweak the final implant volume. Since you would like a filling of the breast, and want to avoid the fake look, choosing the implant size based on breast measurements is best. Next, I would like to bring to your attention the fact that breasts must follow a set ideals to be classified as natural. Natural breasts have the following characteristics: · The areola should not be abnormally large relative to your nipple. · The nipple should be above the breast fold - inframammary fold · The 2 nipples should form an equilateral triangle with the notch of your breast bone · The breasts should not be sagging and must be symmetrical · The nipples should sit directly behind the part of the breast that projects the fullest · The breasts must have an upward pointing nipple (angled at 20 degrees) · There must be a slope in the upper pole of the breast · There must be a tight curvature (convexity) in the lower pole of the breast (i.e., below the nipple) · Finally and most importantly, there must be an upper pole to lower pole ratio of 45:55 (i.e., the percent of fill below the nipple should be 55% compared to 45% above the nipple) If your breasts meet these ideals, then they will look natural. The point of telling you this was to inform you that there are many factors other than implant size which go into creating natural looking breasts such as the profile of the implant (moderate profile for natural), the shape of the implant, the incision used (IMF for optimal results), and even the pocket of placement (submuscular for long-term results). Please book an in-person consultation with a board-certified surgeon and make sure to fully and comprehensively share your desires, expectations, and concerns. Make sure to choose a surgeon you can trust. Your surgeon should be someone who does not rush you, and someone who does not agree to everything you say because safety should be the first thing on their mind. Clearly, you wouldn’t know what is best for you, so they should guide to make decisions that will minimize complications and allow you to have beautiful breasts in the long-term. Verify their skills, education, and certification. Ask about your surgeon’s experience about the procedure you want and ask to review photographic examples of your surgeon’s work. Check to see if the aesthetic ideal is consistent with what you are hoping to achieve. Make sure the before and after images have the same perspective, the same lighting. Read the surgeon’s reviews for the procedure you want Hope this helps