I’m having 260 as well but unders. I’m a 30/32 A now and have been advised to buy a 32c and 32D sports bra. As my op is only in 2 weeks I’ve bought both sizes and going to take the one that doesn’t fit back. I’ve also bought a macom in size Xs. The good thing about these is you only buy your back size and the cups expand to fit any cup size so you could just start with that and then try on sizes on a you’ve had your op and feel up to it. I got my macom off eBay and sports bras from M&S.
id get a 32C, the cup needs to be snug … I had 300 cc unders and im in a 32C, I fit a 32D bra but in the sports bra it must be tight and snug even if it is too small xx