Why Double D Bra Size?

Why are AA cups smaller and DD cups larger? There is no definitive answer as to why an AA cup is smaller than an A but the double-lettered cups that follow D (for example, DD, EE, FF) are all larger than their original size - it is made particularly confusing as there are no international standards for bra sizing.

What is the difference between D and Double D?

A 38D would be a chest measurement of 38 inches and a breast measurement of 42 inches. The 4 inch difference in the two measurements is a D cup. And so on. ... A breast measurement 5 inches larger than the band size is a DD and a breast measurement 6 inches larger than the band size is a DDD.

Is Double D same as E?

A DD is a cup size smaller than an E (assuming you kept the same band size i.e and 32DD is smaller than a 32E). DDD is where it gets confusing, some brands don't run that size (here in the U.K., anyway) so a DDD would be equivalent to an E.