You’d still probably fit in the true bra size, but most of my friends look about the same as a 34d and measure e/f, I’m naturally a 34d and my boobs match up to my friends, saying that though my frien. Had 34d she had 400 and looks huge! It all depends on your stats, but I think the implant sizers are a good indication of what you’ll get, with unders one surgeon told me once you can lose 20% going under so I’d go for the bigger, I tried on 525 and it felt heavy but I liked the heavyness hehe xxx