Chances are, you aren’t wearing the right bra size — roughly 85% of women are in the wrong bra, and even for the lucky 15%, it’s almost impossible to just have one bra size.
Bra-Sizing Myth Number 1: I’m wearing the right bra size, and it is x.
Every woman has weight fluctuations throughout the year, and unless women are being re-fitted roughly every six months, they’re probably wearing the wrong size. If you’re not sure that you’re wearing the wrong size, here are a couple of tell-tale signs to look for:

- Do your breasts look weird underneath your shirt, like they’re sticking out over the top? That’s a key indicator that you’re wearing too small of a cup size, and that your breasts are spilling over the bra, and are not fully supported.
- If you lift your arm above your head and look at the wire of your bra, how far back is it going? If your cup isn’t actually covering all of your breast along the side of your body, this is another sign that you’re wearing too small of a cup. Another key indicator here is if you have skin spilling over the sides of your bra
- Do your straps dig in to your shoulders? If so, you’re probably wearing too large of a back size, and your breasts are not getting enough support.
- Does the cup of your bra stick out from your breast and bunch up in certain areas? This is a sign that you’re wearing too large of a cup size, and should size down a size.
Bra-Sizing Myth Number 2: All bras are the same
Once you’ve sussed out your size range, you’ll quickly find that some bras work better for you than others. There are a variety of bra types out there, the main four being:

- Full Cup: These are bras that go all the way up your breast at an angle, covering a great deal of your breast.
- Balconette Cup: These bras, also sometimes called “shelf” bras, are cut almost horizontally across the breast, rather than along the top. These bras cover much less tissue than full-cup, and are also called demi-cup or half-cup bras.
- Plunge: These bras cut away dramatically at the inside of the breast and cut farther down into the cleavage, allowing you to wear V-cut tops without your bra showing
Depending on your size, certain types might work better for you: for example, a woman with a smaller cup size may struggle with full-cup bras, as the fabric might often “pooch out” over the breast if the cup does not match your breast shape exactly. A balconette or a triangle bra might work better, depending upon your shape. Larger sizes may find difficulties with balconette bras, as their breast tissue might spill over the top, creating the unfortunate quadraboob effect. You should experiment with different bra types to find out which ones work best for you.
Bra-Sizing Myth Number 3: I can buy the same size across all kinds of brands
Just like with different bra types, your size can change dramatically across bra brands as well. There is no one standard bra-sizing convention for companies to go by, so just as your Gap jeans don’t fit the same as Rock & Republic, Rigby and Peller isn’t going to size the same as La Perla.
The cup sizes are even worse — some brands use double-letters like DD, EE, and FF cups, some brands simply “round up” to a larger size like E, F, G, and some brands call what should be a G a FF. Even with guidance, the reality is that you’ll need to experiment with each brand to make sure what size you are. This sounds pretty daunting, but once you find a few brands that you’re happy with, you can pretty comfortably stay within their ranges and be confident that they will fit.
Bra-Sizing Myth Number 4: To make my bra fit better, I just tighten the straps
This is a very common myth for bra sizing, one I believed myself for many years — if a bra wasn’t comfortable for me, I just kept tightening the straps until I thought I had a good fit. In reality, the straps are the least important part of your bra, and they should not be supporting your breasts. A properly fitting bra supports the breasts at the band, meaning you should be able to pull the straps completely down and still feel supported by the bra.
Bra-Sizing Myth Number 5: I have a big back size and a small cup size
This is the single biggest bra-sizing myth out there — women who wear the wrong bra size almost always have their back size too large, and their cup size too small. In reality nearly half of women are over a size D, and while there may be less choices for D+ cups, there is a huge payoff in confidence and comfort when you do wear the proper size. Your entire body shape will change when you’re wearing a properly-supporting bra, and many say it is an instant way to look like you’ve lost ten pounds!
So How Do I Find the Right Bra Size?
- Step 1
- Ensure an accurate measurement
- Wear your best fitting bra in order to get the most accurate measurement. Make sure the cups are not too small as this will give a smaller cup size than you require.
- Step 2
- Measure band size
- Run a tape measure all the way around your body just underneath your breasts and take a measurement in inches. If the number is even, add 4 and if it is odd, add 5. This will give you your band size. For instance, if you measured 28 inches, your band size will be 32.
- Step 3
- Calculate cup size
To find your cup size, measure around the fullest part of the bust in inches, not too tightly or the measurement will be inaccurate. Then subtract your band size from this measurement. This will help you to determine your cup size. If the bust size is less than the band size, you are an AA cup. If there is no difference between the two measurements, your cup size is A. A 1 inch difference indicates a B cup, 2 inches is a C cup, 3 is a D cup and so on. You can use this chart to find out your cup size.
-1 inches AA
0 inches A
1 inches B
2 inches C
3 inches D
4 inches DD
5 inches E
6 inches F