Thank you for your question. 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. Bra sizes 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. Complicating the situation further, your breast size may vary on a monthly basis because of menstrual cycles and weight gain and weight loss. 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. If we consider all things being equal – i.e., you get a bra from the same manufacturer and of the same style, 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. An implant by the size of 485 may provide full 2 cups increase to a 38 D. However, it is also important to considering the profile as even a small implant with a high profile can increase can sizes by the same amount. Furthermore, because the implants will be placed directly behind the breast tissue, direct pressure will cause more significant augmentation and shaping relative to behind the muscle implant placement. Now, it is good that you already did bra-sizing trials and are trying to think ahead by getting a bra before-hand, but 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. I am assuming you have gone to a board-certified plastic surgeon, and they will assist you in choosing an implant that is more tailored to your breast characteristics in order to provide natural looking breasts. The implant has to fit YOUR body dimensions. The more you deviate from the proper fit, the more fake your breasts will look. Surgeons use what is called tissue-based planning. 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), and breast tissue wasting. To determine the implant size, breast measurements must be made: 1) Base Width of the existing breast tissue, 2) 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. So please focus more on having full and natural looking breasts rather than trying to fit into a particular bra-cup size. Hope this helps