To know the actual volume of a F cup we need to know the back size it is teamed with as this will affect its actual size. Below is an example of how cup size volume increases when you increase the back size.
Each of these cup sizes is one cups worth of volume larger than the last as they have increased one back size. So a 12F is one cups worth of volume larger than a 10F. This then nicely leads us on to sister sizing. As the same letter cup size e. F increases with every back size, it also means that in order to keep the cup volume the same we need to change the letter that goes with it.
Each of these cup sizes are the same volume, all that is changing is the band size it is teamed with. If you took the cup from the 10G and placed this over the boobs of a lady who wears a 14F they would fit the same but the back would be too tight. It can be really useful to know your sister-size as some brands vary and if your body changes but your boobs stay the same you can go up or down in the band size without compromising on your cup fit. If you'd like some help or advice then please do not hesitate to contact our team of specialist bra fitters who will be more than happy to advise you on what style and size you should try.
You can get in touch with them via the form below. Cart 0. Call us: 02 All Knickers Shapewear Hosiery. Because if you know the answer to this question you really know all there is to know about bra sizing. It is very understandable for any woman not to wear a well-fitted bra. Bra sizes can be very close together. The same woman might actually fit more than one bra size. And all these bra sizes may fit her just fine!
So, it may seem cup B is bigger than cup A. A cup vs B cup could mean. A little change in measurements could mean you need a totally new bra size. For example, your bra size is 38C. The bras 36D and 40B all have the same cup volume. If you go up a band size, come down a cup size. Likewise if you go down a band size, come up a cup size. Consider Sister Sizing only when you absolutely can not find the perfect fit from the bra that you want.
In the chart, find your size, then look at the sizes directly to the left and right of your size - those are your sister sizes. Toggle navigation Shop. Click Here Terms and Conditions Apply. How a Bra Should Fit. It should fit comfortably around your torso, parallel to the floor.
The band should be snug but you should be able to slide two fingers between the band and your skin. The band should never ride up toward your shoulders. They should stay in place without digging into your shoulders. Whether you're wearing a full cup or a demi cup, your breasts should fit inside the cup with no spillage over the top, under the cup or around your underarms.
If you're spilling out of the cup, you need a larger cup size. If there are wrinkles in the fabric of the cup, you need a smaller cup size. If the gore is not flat against your sternum, your cups are too small. The underwires should never dig into your breasts, your chest or underarms. In a properly fitted bra your nipples should be halfway between your shoulders and elbows, facing forward.
Adjust your straps so your breasts are in this position. The bra should fit on the loosest hook, this allows you to tighten the bra as the elastic relaxes over time. Your bra should stay in place when you lift your arms or bend over. Images courtesy of Panache Lingerie.
You should be able to answer YES to these questions: Do your breasts fit in the cups without bulging, spilling or gaping? Does the gore lie flat against your chest wall? Do the underwires lie flat against your chest wall on all sides? No poking allowed. Is the back of the band straight across your back? Do the straps stay in place without digging into your shoulders?
Can you slide one or two fingers under your bra band? Can you slide one or two fingers under your bra straps? And, you should always be able to answer NO to these questions: Are there any indentations on your shoulders from your bra straps? Do your bra straps leave red marks on your shoulders? Do you have to adjust your bra straps multiple times a day?
Do your breasts look lumpy under your clothes? Are there any wrinkles in the fabric of the cups? Do your breasts pop out of the cups when you move? How Bra Sizing Works. Band size and cup size are not independent measures, they are interrelated. We want to make it simpler for you, so we've created a few tools and charts to help below.
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