It's impossible. I'm currently needing a 44G bra. I used to be 36G but post children I find bras so uncomfortable that even a 42 back seems tight (I'm also a bit of a fatty at the moment but working on that) I cannot find a 44G underwired bra anywhere. Bravissimo only go up to a 40 back, m&s do 44 backs but only non wired. I've tried to wear a 42G but the 1 bra I found only went up to an F cup in 42 back! Help me please my 1 remaining bra that does fit is ready for the bin.