Vanity Fair Response:We are currently working on adding 38DDD to multiple styles to be able to cater to this consumer. This styles are currently not confirmed, but we will have them in the future. Until then you should try the Vanity Fair Full Figure Back Smoother Underwire Bra 76010 or the Vanity Fair Enchanted Lace Woman Bra 75-031. These are both offered in size range 36-42DDD. Until the 38DDD is offered it could just be the style that is uncomfortable in 38DD and 40DD. Both of these bras are great bras with stretch fabrication. Suze from Sydney Australia