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There are 2 important points you should know about bra cups and their sizing:
1) The same cup size letter on different band sizes does not mean the same cup size.
A cup size letter, such as a C cup is not equal in volume across all band sizes. Here is an example. Say you are a 36C. If you move to a 38C, your band size goes up and so does your cup size by one cup size. If you move down to a 34C your band size goes down and so does your cup size by one cup size. If you want a larger band size but want to keep your same cup size, you should move to a 38B.
I know, It’s a crazy fact, but true. So, why does the industry assign the same cup letter to different band sizes, when the cup size is not equal?
The cup size letter is actually a measurement of how far your breasts project from your chest wall. Each letter denotes a 1″ increase in your body’s circumference around your bustline. When you take your bust circumference measurement and subtract your underbust circumference measurement, the remaining inches represent your cup size. A C-Cup, for example is 3″ difference between these 2 measurements. But a 3″ difference is a big deal with small band sized women, but not such a big deal with larger bandsize women. So, this is why a C cup shape and depth changes with each band size.
2) If you are a DD cup size or larger, your cup size could be called many things.
Women with cup sizes larger than a D cup have an added challenge because many bra manufacturers have chosen to create their own letter naming conventions. For example, a DDD cup size is called an E cup size in some brands, and an F cup size in yet other brands. So, if you don’t know how a certain brand names their cups, you can wind up with the wrong cup size and think the bra is running too small or too large in the cups.
My suggestion is to figure out how many cup sizes larger you are than a D cup. Say you are a G cup size in Chantelle. This means you are 3 sizes larger than a D cup. Now, you can look at any bra, see how they name their cup sizes, and count up 3 cup sizes from their D to find your size. At HerRoom when you look at the sizes available on any of our bras, we always display the cup sizes in order from smallest to largest. So, in our Chantelle example, find the D cup in the bra you are interested, count down 3 sizes, and that is your size in a G cup.
In an effort to help you find your cup size in any brand, HerRoom has created a Universal Cup Size™ solution system that we display to the right of every D cup size and larger. Keeping with our suggestion about finding how many cup sizes you are starting at a D cup, our system is simply that number with a D. So, if you are the next cup size after a D cup, you would be a D2, 7 cup sizes larger than a D would be a D8. But we make this all very simple; just find your UCS™ using our simple tool, and you can search on our site using your UCS size. Or, see your UCS™ on all our bras when you look at our size drop down.