I've measured myself using the " new" system ie not adding inches to the waistband. I come out as a 32C. I've always work 36A in the past as I'm quite wide around the rib cage.
I've bought this new bra which is 34 C. I usually wear underwired t shirt bras which are a lot more padded so I'm struggling to work out if it fits or not. It feels comfortable but my boobs look different to how they usually look in a bra so I'm really unsure.