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After the D cup, things get tricky. American brands include Wacoal, Felina, Victoria's Secret, Donna Karan, Playtex, Warner, Calvin Klein. Very few offer larger than a D cup. Those that do, such as Wacoal, offer a D,DD,DDD, and then G. So their G equals 4 D's. However, Wacoal does run large in the cups, so if you need 4Ds in another brand, you may not need it with Wacoal.
European brands, such as Le Mystere, Aubade, Prima Donna, Simone Perle, Natori and Chantelle don't have double letter notations. The exception being Chantelle. Sometimes this bra maker will offer DD, sometimes not. (But if so, their DD still equals their E cup) Another exception is Lepel, I believe this is an Italian company, but it uses UK sizing. Generally speaking, sizing will run D,E,F,G, and so forth. So a European company's G cup will equal 4 D's. Which sounds like they should be the same as American brands, but they're really not. European cups run smaller.
Next comes the UK manufacturers, which are my favorite not only for quality, comfort and fit, but the variety offered. Examples of UK bra makers are Fantasie, Freya, Fayreform, and Panache. the sizing for UK is D,DD,E,F,FF,G,GG, etc. so , a G cup for a UK brand = 6 D's instead of the 4 D's for American and European brands. Strangely, UK brands do not have a double E cup size. I know not why.