Must go down a cup size and up a band size or two. Usually I wear a 40 or 42 in a I or J cup. Bra need a few day to get used to. I found after a few days, bra has fantastic support. Wide Straps and Back, no shoulder pain. Inner sling in cups give the support for large and heavy breasts.
Been wearing back hook version of this bra for over 10 year. Do not like fit of Front Hook, even though it is easy to put on. Wear occasionally when need a bra in Black. Give good support, but not that comfortable.
