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Forget the measuring tape. Start by understanding how bra sizing works and what the right fit should feel like. Our guide gives you the tools you need to fit yourself. It’s easier than you think.
Many factors can affect your bra size such as pregnancy, hormones, weight fluctuations, exercise, etc. It’s important to re-evaluate your bra fit once a year.
There are 4 key areas that determine how well your bra fits. Instead of using a tape measure, our approach to bra fitting is to give you the knowledge you need to fit yourself.
Now that you’ve assessed the fit, here are some solutions to common bra fit problems.
A summary of size conversions for bras, bodysuits, slips and knickers.
Bra sizes are made up of a number and a letter. The number represents your back size and the letter represents cup volume.
The letter (cup) does not represent one single size (i.e. not all B cups are the same size). The letter represents a difference (in inches) between the back and bust measurement.
One inch difference is an A, the second is a B, the third a C, the fourth a D, and so on.
Each column in our size chart below represents bras with the same cup size, but different back sizes. For example, 36A, 34B, 32C and 30D all have different back sizes, but share the same cup size. They are often referred to as ‘sister sizes’.
When changing bra sizes, always remember: If you change your back size, the cup size will also change.
For example: 34DD is a back size AND a cup size bigger than a 32DD
A = 1” difference
B = 2” difference
C = 3” difference
D = 4” difference
DD = 5” difference
E = 6” difference
F = 7” difference
G = 8” difference
The underband/band is the anchor of your bra. It’s where most of the support will come from.
Fasten your bra on the loosest hook and eye setting. This will allow you to tighten your bra (and keep it fitting perfectly) as it starts to ease out over time.
The band should fit snugly (you should only be able to fit two fingers under it) and lie parallel to
the floor all the way around your body, even when you shrug your shoulders or move around.
Since the band is your bras main source of support, straps do not need to carry any weight or dig into your shoulders.
They should just be resting on your shoulders, with roughly 2” of slack when lifted off the body.
It’s ok if one is shorter than the other as the left and right breast are often different sizes.
Women often wear cups that are too small, causing breast tissue to spill out at the top or sides. If they’re too big the cup hangs away from the body. Aim for a smooth, snug fit.
The reinforced front part of the band that lies between the breasts. On underwired bras, the
centre front should fit flat against your chest. If it’s lifting away, your cups might be too small.
On wireless bras, the centre will lift away slightly.
Wires (or if you’re wearing a wireless bra - the seam connecting the cups to the underband) should lay flat against your rib cage, including under your arms.
Lift yourself up and into each bra cup. Tighten the straps so you have about 2” of slack on each side when the straps are lifted off your shoulders. If your cup size is still too large, go down a cup size.
Example: You’re wearing a 34D and the cups are puckering, but the back fits perfectly. Try going down a cup size to 34C.
Your cup size could be too small. Try going up a cup size or choose a bra style that offers more
coverage for example, a Classic bra, Balconette or Longline instead of a Demi Cup. Browse Bras
Example: You’re wearing a 34D and the back fits perfectly, but you’re bulging out of the top/sides of the cups. Go up a cup size to 34DD.
This is very common as left and right breasts are often different sizes. You should always fit to
the larger cup. Adjusting the straps or trying a style with a different fabric may help hide the difference.
Underwires tip away from your body at centre front? Your bra cups are too small. Try a larger cup size.
Example: You’re wearing a 34E and the back fits perfectly, but you’re bulging out of the top/sides of the cups. Go up a cup size to 34F.
Your band size is too large. Try going down a back size. The band should fit snugly enough that it lies parallel to the floor even after moving around and shrugging your shoulders.
Example: You’re wearing a 34E and the cups fit well but the band is too loose. Go up a cup size (to keep the same cup size) and down a back size to 32F.
If the straps are digging in or you’re feeling strain on your shoulders, it might be a sign that the under bust band is too big and not giving enough support.
Example: You’re wearing a 32E and the cups fit well but the straps are digging into your shoulders. Go up a cup size (to keep the same cup size) and down a back size to 30F.
If after being adjusted, the straps are slipping down your shoulders it might mean that your band size is too small. Try going up a band size and down a cup size to compensate.
Example: You’re wearing a 34E and the cups fit well but the straps are falling off your shoulders, go down a cup size (to keep the same cup size) and up
Example: If you’re wearing a 34E and finding the cups and band are too big. Go down a back size to 32E.
Example: If you’re wearing a 34E go down a back size to 32, and up two cup sizes to G (32G).
How To Change Sizes Depending On Your Fitting Needs
Go up a back size and down a cup size
Keep the same back size, but go up or down a cup size accordingly
Go up a back size
Go down a back size
Go down a back size and up two cup sizes
Go up a back size and down two cup sizes
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