What is 38d vs 38dd?

The difference between 38D and 38DD is the cup size. 38D is the size where the band size is 38 inches and the cup size is 'D'. 38DD is the size where the band size is 38 inches and the cup size is 'DD'. The cup size increases by half an inch between D and DD. Therefore, 38D is equivalent to 36DD and 40C. While 38DD is equivalent to 36DDD/F, 40D, and 42C. It is important to note that the correct size may vary depending on the brand and individual measurements. It is recommended to try on different sizes for the best fit.