
Many women in Australia struggle with understanding bra sizing and finding the perfect bra fit. Bra sizes vary between countries and manufacturers, and the right bra size for you will depend on your body shape. To find your bra size, you need to take measurements of your underbust (the band size) and overbust (cup size). You can then use a bra size calculator to determine your bra size. However, it's worth noting that bra size calculators are not always accurate, especially for women with larger busts. In this case, it may be better to book a fitting appointment with a trained consultant.
| Characteristics | Values |
|---|---|
| Bra size components | Band size and cup size |
| Band size | Calculated by measuring the ribcage girth, or the underbust, in inches |
| Band size conversion | 32" = 10, 34" = 12, 36" = 14, etc. |
| Cup size | Calculated by measuring the fullest part of the bust, or the overbust |
| Fitting | The band should be tight and secure, but two fingers should fit under the band at the back and one finger in the centre front |
| The breasts should be fully encased within the wire, which should sit flat against the body | |
| The wires should sit close to the chest, and the bra should stay in place when the arms are lifted | |
| The straps should sit snug against the skin |
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What You'll Learn

Measuring your underbust
To measure your underbust, you'll need a measuring tape. Stand with your arms resting by your side and ideally get someone else to measure around your body, directly underneath your bust. Make sure the tape is right under your breasts, straight all the way around, and as tight as possible without being uncomfortable. This is how the underband of the bra will fit, so the tape should be firm but not too tight. It's best to do this measurement without a bra on, but you can also do it with one—just be careful not to place the tape over your bra or underwire.
The underbust measurement will determine the band size of your bra. Many bra bands have some elasticity, so make sure to hold the tape measure firmly around your body without any slack. This is important because a firmly fitting band will provide the most support, alleviating pressure on your shoulders from the bra straps.
If you're measuring yourself, it can be tricky to get an accurate underbust measurement. The tape should be straight across your back and parallel to the floor. You don't want it to ride up your back, as this will result in a band that's too big.
After taking your measurements, you may find that you fall between sizes. In this case, it's recommended to try on different options before making a final decision, as bra sizes can vary between brands and styles.
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Measuring your overbust
To measure your overbust, or bust size, you will need a measuring tape. Stand with your arms resting by your sides and ask someone to wrap the measuring tape around the fullest part of your bust, usually over the nipple. If you are measuring yourself, hold the tape gently so it is resting lightly on your body. Make sure the tape is straight across your back and parallel to the floor. This measurement will help establish your cup size.
It is best to take this measurement while wearing a bra. This will ensure you get the most accurate measurement. The tape should sit lightly against your bust while you take the measurement.
It is important to remember that bra sizes can vary between manufacturers and countries, so your measurements may not correspond exactly to a particular bra size. For example, a 34B bra from two different companies may not fit the same person due to this lack of standardisation.
After taking your overbust and underbust measurements, you can use a bra size calculator to determine your recommended bra size.
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Understanding band sizes
To measure your band size accurately, it is recommended to have a friend help you. Stand with your arms resting by your sides and ensure the tape measure is straight across your back, parallel to the floor. The tape should be tight, but not uncomfortable, as this is how the underband of the bra will fit. This measurement will help you determine the band's size, which is the part of the bra that goes around your body.
It is important to note that bra bands have some elasticity, so hold the tape measure firmly without any slack. A firmly fitting band will provide more support and reduce pressure on your shoulders from the bra straps. If the band is riding up your back, it is too big, and you may need to go down a size or tighten it. On the other hand, if your straps are slipping off your shoulders, it could indicate that your band size is too small.
While measuring, remember that band sizes can vary between different countries and manufacturers. Therefore, it is recommended to refer to size charts and conversion charts specific to Australian bra sizes. Additionally, consider trying on different options, as not all bras with the same band size will fit the same due to variations in style, shape, and fabric.
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Understanding cup sizes
The cup size is the difference between the band size and the measurement of the bust at its fullest point. The cup size is denoted by a letter, typically ranging from A to E, but can go up to K. While cup sizes are standardised with these letters, the volume of the cup differs between band sizes. For example, a 42C cup is larger than a 34F cup, despite F being a larger cup size than C.
Cup sizes are not based on any specific measurement because breasts come in all shapes and sizes and are hard to measure consistently. The volume of the cup is relative to the band size, and so a 34A cup is much smaller than a 38A cup, even though both are an 'A' cup.
It's important to note that cup sizes are not standardised across brands, and a C-cup in one brand may be a D-cup in another. Therefore, it is recommended to try on bras in person to ensure a good fit.
To measure your cup size, most retailers recommend wearing a non-padded bra that you find comfortable. Then, measure the fullest part of your bust, usually over the nipple. Once you have your bust measurement, subtract the band size measurement from it. The difference in inches will give you your cup size. For example, a difference of 3 inches is about a C cup.
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Signs of a poor fit
To measure your bra size in Australia, you must first establish your underbust and overbust measurements. The underbust measurement will determine the band size, and the overbust measurement will help establish the cup size.
Now that we have covered how to measure your bra size, here are some signs that your bra might not be fitting you correctly:
Underband Issues
If your bra band is riding up at the back, it is likely a sign that the band is too large and you need to size down. A band that is too tight can also be a sign of a poor fit, causing discomfort, back pain, and even difficulty breathing. In this case, you should opt for a larger band size.
Cup Problems
If your breasts are spilling out over the top or sides of the cups, it is a sure sign that your cups are too small, and you need to size up. On the other hand, if there is gaping at the top of the cup, it could be a sign that your cups are too big, and you need to size down. If you notice excess material in your cups, you will also need to size down.
Underwire Discomfort
The underwire of your bra should encapsulate your entire breast tissue. If the underwire is uncomfortable, it is likely that your bra is the wrong size. If the underwire sits on your breast tissue, it is a sign that your band is too big, and you need to size down.
Chafing
Chafing can occur when there is friction between the skin and the fabric of the bra. This could be a sign that the bra is too loose and you need to size down, or it could be an indication that the design of the bra is not suitable for your body.
Neck, Back, and Shoulder Pain
Ill-fitting bras can lead to inadequate support and cause neck, back, and shoulder pain. If you are experiencing this, consider checking your bra size and the level of support it provides.
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Frequently asked questions
Measure around your body, directly below the bust. It's best to do this without a bra on, but if you do wear one, be careful not to place the tape over your bra or underwire. Stand with your arms resting by your side and get someone else to measure you. The tape should be straight all the way around and tight, but not uncomfortable.
Measure across the fullest part of your bust (usually over the nipple). This is best done while wearing a bra. Hold the tape gently so it rests lightly on your body. Make sure the tape measure is straight across your back and parallel to the floor.
The band size is a representation of your rib cage girth. This measurement is taken in inches. In Australia, a 32" rib cage girth is a size 10, 34" is a size 12, and 36" is a size 14.
Try the different options before making your final decision. If you can't try them on in-store, order a few sizes and return the ones that don't fit.











































