"If you come across a bra with unusual
sizing, you can tell your salesperson you are 2, 5 or whatever
cup sizes larger than a D cup. She will then be able to ascertain
your correct cup size in that style."
Bras for the most part are highly engineered and thoughtfully designed. It's not unusual for a bra design to be
composed of as many as 40 pieces and findings. Though many bras are beautiful, bras are more about playing a supporting
role than they are about fashion. We women need to understand what we are looking at when we try on a bra. Knowing what
design features work best for our figure type will help us more easily identify the style of bra that suits our needs best.
Choose the Proper Cup Size
While the underwire defines your breast's diameter, a cup size defines your breast's projection or cup depth. Cup sizing is alphabetical
- A, B, C, D etc. After the D size, however, manufacturers do not all agree on what to name subsequent sizes. Generally, American manufacturers
prefer D, DD, DDD, DDDD. European manufacturers tend to prefer D, E, F, G. If your cup size is larger than a D, it can be confusing to determine
what size bra to purchase, especially if the manufacturer has a unique sizing convention.
HerRoom has made this easier for you. We've compiled a chart comparing all plus size manufacturers' cup sizing conventions. Simply refer to our
chart to determine your correct cup size in that brand.
It is also a good idea to know how many sizes larger than a D cup you are. That way if you
come across a bra with unusual sizing, you can tell your salesperson you are 2, 5 or whatever cup sizes larger than a D cup. She will then be able
to ascertain your correct cup size in that style.
There are 2 important things to know about cup size.
The first is that a cup size on one band size is not equal to the
same cup size on another band size. In other words, a 32D bra has
smaller cup volume and diameter than a 34D bra yet both are a D
cup. So I bet you're wondering why the industry assigns the same
cup size to both.
Well, cup size is a measurement of how far your breasts project
from your chest wall. Each cup size denotes a 1" increase in your
body's circumference around your bust line. Knowing this fact can
help you zero in on your correct bra size. For example, you try
on a bra and the band feels comfortable, but your breasts are spilling
out. Keep going up in cup sizes on the same band size until you
find the bra that fits. Alternately, the cups fit great, but the
band is too big. When you go down a band size, you now know that
you need to go up a cup size to maintain the same underwire diameter
and similar cup volume (Example: Go from a 40C to a 38D).
The second important point about cup size pertains to women with
cup sizes larger than a D cup. Trying to find cup equivalents among
brands can be very difficult. In one brand you are a DDDD, but this
same cup size can be a G, F, or FF in other brands. The first thing
you should know is that all manufacturers size their cups up by
1" circumference increases. They may call their sizing by different
letters, but the increases between sizes are uniform. So, as mentioned
above, find out how many cup sizes above a D you are. On our site,
when you look at the sizes available in a particular bra, we display
the cup sizes in order from smallest to largest. If you are 4 cup
sizes larger than a D cup, you can count 4 sizes from D to find
your correct size in that particular brand.
The Cup Size Game.
Finding a bra you love and discovering its size range stops just before
your size can be frustrating. However, you may not be totally out of luck.
Say you are a 40C and the bra you have found stops at 38DD. You MIGHT be able
to wear the 38D or 38DD in that bra if the band doesn't feel too tight.
Deviating from your traditional bra size is called the cup size game.
Substituting bra sizes will work more successfully on women with band sizes
40 and above and D cups or larger because there is more breast tissue and body
circumference to work with - a 2" band increase or a 1" bust line circumference
increase is not as significant as it would be on a smaller framed person.
However, having shared this game with you, it is always best to purchase your
true size if you want to maximize proper fit.
A final thought about cup sizes.
When a manufacturer grades his patterns to create different sizes for a bra style,
he moves the bust points slightly wider with each cup size increase. B cup bust points
are 1/2" farther apart than A cups. Bust points get 1/4" farther apart between B, C and
D cups, and 1/8" farther apart with larger cup sizes.