A 40 back is quite large and a C cup on a 40 back is the same cup size as is on a 34E . So no it is not a big cup size, but quite a large band size, and most likely incorrect. Not always, but usually. A lady in a size 40 back bra would , as a rule, be wearing size 16/18 tops.
What size bust is a 40C?
C Sizes Under Bust Fullest Point
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36C 30"-32" 37"-39"
38C 32"-34" 39"-41"
40C 35"-37" 41"-43"
42C 38"-40" 43"-45"
Which bra sizes are the same?
A 34C and a 32D are known as "sister sizes" which means that the cup will fit the same amount of breast tissue and the same applies for their other "sister sizes" of a 36B, 38A, 32D, 30DD, 28E.
Do sister sizes fit the same?
Yes, Sister sizes are sizes that have the same cup capacity but a different band size. For example, someone who wears a 32C could also wear a 30D and a 34B depending on if they want a tighter or looser fitting bra.Jan 18, 2021
Do sister size bras fit the same?
What is a sister size? Sister sizes are bras with the same cup volume. So, in theory your sister size could be swapped for your true size and fit just as perfectly, while the band would fit a bit tighter or a bit looser than usual.Aug 8, 2019
Should I Sister size up or down?
Go up a band size (if your band is too tight), but go down a cup size. ... So, for example, if you're a 34C, your sister sizes are 30E, 32D, 36B, and 38A. Each row is a family of sister sizes. Let that sink in for a moment: an A cup can also be an E cup.May 14, 2019
Why do Sister sizes exist?
Knowing your bra sister sizes can come in handy in a few situations: The cups fit well but not the band – sister sizing lets you try on a larger or smaller band size without changing the cup volume, since you've already found a volume that fits.Jul 8, 2019
What bra size is the same as 40B?
Hi Kay, A 40B would be equivalent to a 38C, 36D, or a 34DD. Thing about bras are... They have sister sizes. That's different band sizes with different cups that are equivalent in volume.
Is 38C bra same as 40B?
In this way, sister sizes are far more accurate. To give you another example, if you're a 38C, your bra belongs to this family: 30F, 32E, 34DD, 36D, 38C (your size), 40 B. So your closest sister sizes are actually 36D and 40B, because while the band may vary, the cup volume is exactly the same.
What size is 40B?
B Sizes Under Band Cup Size
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36B 31"-33½" 37"
38B 34"-36½" 39"
40B 37"-39½" 41"
42B 40"-42½" 43"