Have you ever tried on a bra from a new brand and found that your usual size doesn’t fit? If you’ve experienced this before, you might find it useful to understand sister sizes, which can help guide you towards a more comfortable fitting bra size. Keep reading if you’re a 54 bra band size!
What Are Sister Bra Sizes?
Sister sizes are the bra sizes that surround your usual bra size. This might mean changing your cup size, band size, or both.
When you try on a new bra and it doesn’t fit, this could be down to any number of reasons, including a new brand or a new style of bra. Understanding your sister sizes will help you make an informed choice as to which other sizes you should try on to achieve the perfect fit.
You can read more about sister sizes in our What Are Sister Bra Sizes blog.
Size Chart For Sister Sizes For 54 Bra Band Size
This is our sister size chart for a 54 band size. Find your current bra size in the first column, and discover what sister sizes we’d recommend for sizing upwards or downwards.
| Current Bra Size | Sister Size Down | Sister Size Up |
| 54B | 52C | |
| 54C | 52D | 56B |
| 54D | 52DD | 56C |
| 54DD | 52E | 56D |
| 54E | 52F | 56DD |
| 54F | 52FF | 56E |
| 54FF | 52G | 56F |
| 54G | 56FF | |
| 54I | 52J | |
| 54J | 56I |
How to Find Your Sister Bra Size
When you’ve located your current bra size on the chart, you’ll be able to read across and discover your sister sizes. There is an option to size up, if the bra you’re trying on feels too small, and an option to size down, if the bra you’re trying on feels too big.
If you go up in band size, you may need to go down in cup size. If you go down in band size, you may need to choose a higher cup size. This is just a guide - please note that sister sizing can be quite complicated as you may need to adjust both the cup size and the band size to get the best fit.
Sister sizes can be other sizes that surround the initial size. Take a look at our example chart.
Find Comfortable and Supportive Bras from AmpleBosom
Visit our Bras page to browse our incredible collection of bras for all body shapes and sizes, including the fuller figure. You can filter by size, so you can see which bras we have available in your usual size and your sister sizes.
Our collection features over 250 different bras in band sizes 28 to 58 and cup sizes AA to N. There are many different styles and features to suit your body shape and lifestyle. With so many to choose from, it can be quite daunting to know where to start, but our knowledgeable team is here to help! Give us a call on 01439 798388 and we can help you find your perfect bra.
Bra Measuring and Fitting Advice
For additional advice on finding a well-fitting bra, visit our blog posts:
Sister Bra Sizes from AmpleBosom
Here at AmpleBosom, we’re happy to answer any questions you may have on sister sizes or anything else! Our friendly team is on hand to give you specific recommendations on bras from our collection based on your measurements. You can either call us on 01439 798388 or drop us an email. You can even book an appointment to visit us here in North Yorkshire and have a personalised bra fitting.
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Written by AmpleBosom 02/08/2018 and Sara/Jess edited 02/09/2024.