Depending on the brand and country of origin, there's no labeling standard once you pass a D-cup. I believe the UK system is D, DD, E, F, FF, G, GG,... I think the rest of Europe typically uses D, E, F, G, H, J, K,... Sometimes I've seen D, DD, F, G, H,... North American brands tend to go D, DD, DDD, and often stop there. Don't quote me on any of this because it can vary a lot. They seem to randomly decide which letters to double or skip altogether. I've heard of I-cups but I don't think they're always used. I don't think EE exists anywhere. The further you get from a D-cup, the more discrepancy there is. A G-cup in one brand might be equivalent to a J-cup in another. The store I shop at has their own system for their tags. They know what system each brand uses and they just use a number for the equivalent number of Ds. So a 32DD is labelled as a 2-32. A 3-36 might be a 36E in one brand and a 36F in another, but it's the equivalent of a 36DDD. It's so annoying that there can't just be a standard.