my op is tomorrow and I’ve bought two macoms; they just go off back size as they ‘grow’ with your cup size, i got one in my normal back size and one for swelling so a size up, (32 & 34) i only bought them cause you don’t know for sure the size you will end up but they don’t look or feel the nicest of post-op bras (although loads recommend them)…
i’ve also bought a 34F m&s zip up front one and the asda zip up front one in a 32E, i’ve been told i will come out an E but you really just don’t know. Really now i wish i had just have bought macom’s and then bought others afterwards, but I’ve kept the receipts to take back/exchange when i know my true size… if your not buying a macom personally i would buy a few different sizes to make sure you have one that is right and then take others back when you know which ones you don’t need, ask your surgeon/PC/nurse what sizes or bras you should get if unsure xx