your surgeon will decide on if you can go as big as that, and give you some ideas on size. i wanted to be a d from 32a, and i could, with 380’s (the biggest on offer to me), others with very similar stats to me, have had 525’s and bigger, and others have been able to have 280’s max, if all depends on your frame, chest, and tissue to start with. the surgeon usually chooses on where he places the implant, a few girls on here have had the choice, and others who havent had the choice arent happy as they wanted the opposite (especially as overs heal quicker, so you are able to get back to daily life qicker)
im wearing a dd sports bra now, but been measured at 32f in la senza, and 30dd in debenhams, fairyxx on here had no tissue to start with, had 380’s and hers just grew, i think shes about 10 months post op now, and in an f, but looks a dd (and yes fairy you do, not a c), as implants measure bigger then they look
hope this helps. feel free to add me and take a peak at my pics xx