I'm currently wearing a 40D bra fitted by M&S (I know...) and the band is rising up a lot at the back so I measured myself and got 34.5 underband 45 over which gives me about a 34GG/H?
However, even when I scoop (fairly vigorously) my current bra is only slightly small in the cups (no overspill/ quadboob) and a GG would be like going up 3 cups so I am a bit worried it is going to be too big.
Current bra is non wired and not padded (www.marksandspencer.com/total-support-non-wired-embroidered-b-g-bra/p/p22141338?mfPartNumber=T337020&carousel=FUNH_RR) so may be a bit more 'forgiving' than some styles.
Any suggestions on sizing and how to pick a comfortable style, as I have never had a wired bra I could wear for more than about an hour, would be very much appreciated 