What is difference between 38d and 38dd?

38D and 38DD are two different bra sizes.

38D is a bra size where the band size is 38 inches and the bust size is around 4 inches larger than the band size, which makes the cup size 3-4 inches larger than the band size. The cup size would be equivalent to a medium to large size.

38DD, on the other hand, is a bra size where the band size is 38 inches and the bust size is around 5 inches larger than the band size, which makes the cup size 5-6 inches larger than the band size. The cup size would be equivalent to a large to extra-large size.

Therefore, the difference between 38D and 38DD is the cup size. 38DD has a larger cup size than 38D, which means it provides more support and coverage for larger busts.