Have you ever found that your usual bra size doesn’t fit when you try on a new bra? This could be due to any number of reasons, and it’s important to understand your sister sizes so you can find an alternative size that does fit. We’ve put together a size chart to help you find similar sizes to try on, so keep reading if you’re a 34 band size!
What Are Sister Bra Sizes?
If you are finding that your usual bra size isn’t fitting correctly, this could be down to any number of reasons; a different manufacturer, a different brand, or a different style of bra. Any of these reasons may mean you have to look for a different size of this bra.
Sister bra sizes are the sizes that surround your bra size. It’s good to know what your sister sizes are, so you can try these on if a new bra isn’t giving you the usual amount of support and comfort.
Read more about sister sizes in our blog.
Size Chart: Sister Sizes For 34 Bra Band Size based on UK sizing
This is our sister size chart for a 34 band size. Find your current bra size in the first column, then find out what sister sizes we’d recommend for sizing upwards or downwards.
Click your size in the chart below to view the full range of bras in this bra size.
| Sister Size Down | Current Bra Size | Sister Size Up |
| 32A | 34AA | |
| 32B | 34A | 36AA |
| 32C | 34B | 36A |
| 32D | 34C | 36B |
| 32DD | 34D | 36C |
| 32E | 34DD | 36D |
| 32F | 34E | 36DD |
| 32FF | 34F | 36E |
| 32G | 34FF | 36F |
| 32GG | 34G | 36FF |
| 32H | 34GG | 36G |
| 32HH | 34H | 36GG |
| 32J | 34HH | 36H |
| 32JJ | 34J | 36HH |
| 32K | 34JJ | 36J |
| 32KK | 34K | 36JJ |
| 32L | 34KK | 36K |
How To Find Your Sister Bra Size
When you’ve identified your current bra size on the chart, you’ll find sister sizes to size up and size down. You can choose which one to try on depending on whether your current bra feels too tight or too loose.
Our general advice is this: 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.
Please note that this is just a guide. Sister sizing can be quite complicated and 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 based on UK sizing.
Please don't hesitate to give our experienced team of bra specialists a call on 01439 798388 if you would like advice about sister sizes and finding a comfortable and well fitting bra.
Related Searches: 34E Bra Sizes | 34F Bra Sizes | 34G Bra Sizes | 34GG Bra Sizes | 34H Bra Sizes | Underwired Bras | Non Wired Bras
Find Comfortable and Supportive Bras at AmpleBosom
Here at AmpleBosom, we’ve got a fantastic range of bras in a variety of different styles from the world’s leading brands. Visit our Bras page to browse the collection, and filter by size so you can choose your usual size and your sister sizes.
We have an extensive range of over 250 bras to choose from, stocked in band sizes 28 to 58 and cup sizes AA to N. We’ve got something to suit everyone’s body type (including the fuller figure), lifestyle, and budget.
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.
We have picked out some options for you to take a look at in a band size 34. However see are full range of bras here.
Illusion Underwired Side Support Bra– FL2982
The Fantasie Illusion bra has become a firm favourite with both us in the AB office and our customers. This everyday bra is a must have, with a three section cup and added side support for a modern forward projection. The innovative centre pull straps have been a game changer for our customers who suffer with slipping straps (always makes sure you’re in the correct size first, as that is the leading cause for slipping straps) The flat lace design is not only pretty but practical for under clothing. In some fantastic continuity colours Black, White, Natural Beige, Navy and Blush and each year comes in some gorgeous seasonal colours. In a great range of sizes from back size 30-42 and cup sizes D to J
Rosa Faia Twin Non Wired Bra - Product Code 5493
A best selling non wired bra and a popular choice with customers that Sally recommends as her new favorite non wired bra. This wireless bra has a slight stretch on the neck edge for a forgiving fit and is made from extremely soft comfortable fabric for confort all day. The Rosa Faia Twin Non Wired bra by Anita comes in 6 continuity colours - white, champagne, skintone, desert, rosewood and black in cup sizes A to F and back sizes 32 to 48. Anita's best selling non wired feel good bra, they claim every woman should have one in her underwear drawer! Take a look today!
Why We Love This Rosa Faia Twin Non Wired Bra
The features of this bra that makes this an excellent everyday bra include....
- A comfortable non wired feel good bra for all day comfort.
- Double layered for added comfort and a smooth look.
- Made from an extremely comfortable smooth silky, microfibre fabric.
- A slight stretch on the neck edge for a forgiving fit.
- Adjustable straps for ease of fit.
- Wide comfort straps to add extra comfort to your shoulders!
- E cup and above have reinforce straps for added support.
- This is a medium support bra.
- A seamless bra for a smooth appearance.
- A full cup bra to support the breasts.
Luna Wirefree Fuller Bust Firm Support Bra – 1355
The Luna bra from Royce is a much loved bra for many of our fuller busted customers. The high cotton content fabric provides a strong firm support without an underwire whilst staying soft to the touch for sensitive skin even for the bigger busts. The Luna bra is fully lined with a three section cup with an added side panel giving comfort, support and a forward shape and comes with fully adjustable strap. Available in the colour Grey Marl and comes in back sizes 32-40 F to K cup.
Beauty Minimiser Wired Bra – B521
Ever wanted to look 1 cup size smaller? Then look no further. The Berlei Beauty Minimiser bra does just that. The smooth seamless cup gives the illusion of dropping you one cups size smaller by giving you a rounder shape and instead of pushing you in and forward, separates and pushes you more towards your armpits. The deep under band gives a smooth shape under your arms and back. Comes with wide cushioned straps for that added extra comfort. In Black, Nude and White and sizes 34-44 C to G cup.
Mainly we have two types of sizing UK and EU sizing and this brand Anita falls under the EU sizing which is where you need to be careful as EU sizing doesn’t have double cup sizes so it’s always worth checking the equivalent size you need to be in if you switching from UK to EU sizing or vice versa, Check our size grid here.
If you think it might be time for a new bra and fancy trying a new style or brand and not sure what size it is you need to try. Then don’t hesitate to contact us and the experts at Amplebosom can help advise on the size.
Bra Measuring and Fitting Advice
For additional advice and information on finding a well-fitting bra, visit our blog posts on:
- Bra Measuring Guide - advice on measuring your own bra size at home
- Bra Fitting Guide - hints and tips to make sure your bra fits correctly
- Bra Size Guide - guidance on sizing for the different brands we stock
- Bra Fitting Appointments - book a fitting appointment with us in North Yorkshire
Frequently Asked Bra Fitting & Sizing Questions:
- What Are Sister Bra Sizes?
- How Do I Measure My Bra Size At Home?
- How Do I Find A Comfortable Bra?
- What Are The Best Bra Brands For Big Busts?
- How Do I Find The Perfect Fitting Bra?
- How Do I Know If I’m Wearing The Right Size Bra?
- What Should I Expect At A Bra Fitting?
- When should I have a bra fitted?
- My breasts are not the same size. What should I do?
- What is the difference between UK, US and European bra sizes?
THE BEST BRA FITTING HELP
If you need some advice on measuring your bra size, visit our Bra Measuring Guide blog.
We also have a Bra Fitting Guide blog, where you can find hints and tips for making sure your bra fits properly. Here, you’ll also find our collection of bra advice posts, answering a wide range of different questions.
We offer bra fitting appointments here in North Yorkshire. If you’d like some face-to-face help finding your perfect bra, our friendly team will help you choose a well-fitting and comfortable bra from the wide range of bras and underwear we have available.
You can also visit our Size Guide blog to find out more about sizing for the different brands of bras available at AmpleBosom.
Sister Bra Sizes From AmpleBosom
We have a fantastic team of bra specialists, led by AmpleBosom founder Sally, who are here to answer all your questions and help you find the perfect bra. We can make specific recommendations based on your measurements, so you can buy in confidence. Call us on 01439 798388 or get in touch by dropping us an email.
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Blogpost last edited by Sara 12/06/2025.