They're essentially the same size. The band has to do with the circumference around you back while the cup size is the differential between the measurement of the breast and the measurement right underneath the breast around the ribcage. However, the larger the band, the larger the actually cup even though the letter sizes are the same. So therefore, a 40B, 38C, 36D, and a 34DD are almost essentially the same size. It's just that if you're really petite, you'll more than likely wear a 34DD to get better support around your back even though you may actually fit the cups of a 38C.
D is bigger.
This question is to vague to answer. Equivalent to what size "what"? 38C is 38C.
what is difference between 32dd and 34dd
It is 34DD
34dd
38DD
A 38C bra is a nice large size depending on the owners body size and shape. The breast would fit if the largest part of your breast is up to 3"(three inches) bigger than the the band size.
Her bra size is 38C
34D
38c
No, 36DD is bigger.
After 34D is 34DD. After 34DD is 34E. A chart and calculator is included in the related links below for you.