If you are a 42 band size then this blogpost will advise you on sister bra sizes for 42 bra band size. Sometimes your usual bra size doesn't fit when you try a different bra brand, range or style. So we have put together a size chart to help you find similar bra sizes for you to try.
What Are Sister Bra Sizes?
If you are finding that your usual bra size isn't fitting then this may be down to a different manufacturer, different brand, or even different style of bra which may mean you have to look for a different size for this bra. Sister bra sizes are the sizes that surround your bra size. With the size of bras sometimes differing because of the manufacturer, brand, style and even country, it is good to know about sister bra sizes so you can try other bra sizes if the one you have doesn't match your usual size.
Size Chart For Sister Bra Sizes For 42 Bra Band Size Based On UK Sizing
If you have a 42 Bra Band Size then take a look at the chart below to help with sister bra sizes. Locate your current bra size and then see what your sister bra size is down or up to see if either of these sizes are a better fit in the current bra that you are finding doesn't fit correctly.
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 |
| 40A | 42AA | |
| 40B | 42A | 44AA |
| 40C | 42B | 44A |
| 40D | 42C | 44B |
| 40DD | 42D | 44C |
| 40E | 42DD | 44D |
| 40F | 42E | 44DD |
| 40FF | 42F | 44E |
| 40G | 42FF | 44F |
| 40GG | 42G | 44FF |
| 40H | 42GG | 44G |
| 40HH | 42H | 44GG |
| 40J | 42HH | 44H |
| 40JJ | 42J | 44HH |
| 40K | 42JJ | 44J |
| 40KK | 42K | 44JJ |
| 40L | 42KK | 44K |
| 42L | 44KK |
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 based on UK sizing.
Related Searches: 42B Bra Sizes | 42DD Bra Sizes | 42G Bra Sizes | 42H Bra Sizes | 42J Bra Sizes | Underwired Bras | Non Wired Bras
BRAS
Visit our bra page to view our comprehensive bra collection and you can filter by size to see the bras we have in your size and your sister sizes.
With over 200 bras in our collection we have an extensive choice of bras for you to choose from. They come in a range of sizes from 28 to 58 back sizes and AA to N cup sizes. 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 team are here to help you choose the right bra for you.
Our friendly and knowledgeable team are on hand to help you find the best everyday bra that is comfortable and fits well, so give us a call on 01439 798388.
Here are look at some of our most popular bras in a back size 42:
Elomi Zarla Underwired Bra - EL302505
The Zarla from Elomi is a great addition to your wardrobe, the beautiful lace detailing to the top of the cups is crafted from a non-stretch Tulle fabric which along with the three section cups with added side support gives an extra firm support especially to the bigger/heavier busts. The wings are double layered with the elastic enclosed and with the added chimney back, give a smooth silhouette and prevent any rolling. In continuity colours of black and café au lait and in sizes 32-44E to K cups.
Glamorise Magic lift Classic Full Support Bra -1000
The Magic Lift Collection from Glamorise has an extensive collection of plus size bras within it and the one we are looking at today has fast become one of the most popular. The Magic lift range was built with support, shape, comfort and uplift without the need of an underwire in mind. This bra is no acceptation the two sectioned full cups provide a great coverage and a more traditional shape whilst the wide, padded straps help take some of the pressure of those shoulders. The deep under band helps create anchorage to minimise any movement. In a great range of colours to suit any mood and comes in sizes 36-56B to J cup.
Empriente Thalia Full cup bra - 0756
The famous Thalia bra from Empriente. This bra has been Sally’s go to bra for as long as she can remember. This bra is still hands down one of our most popular bras we sell here AmpleBosom. This bra comes with a two section cup with an added side panel for a more forward and traditional shape. Made from all over delicate and intricate lace and the bottom half of the cups are lined with a tulle lace to give that extra added support for all day comfort. The detailed lacing even works its way up the adjustable straps. This bra is not only practical and supportive but also a stunning bra on. Comes in either black or caramel and in sizes 32-48C to H cup.
The goddess Yvette bra is an underestimate bra. This bra comes with smooth seamless moulded cups that are double layered for a smooth look under tee-shirts. The side panels help give a more forward shape than a rounded shape that you usually find with seamless bras. The centre panel is slightly higher than other bras giving better separation and a higher coverage. The fully adjustable straps also come with limited stretch that helps give a much firmer support for all day wear. The wings are double layered with enclosed elastic for a smoothing effect from any angle. Coming in two continuity colours of black and sand and available in sizes 36-52C to GG cups.
MEASURING GUIDE & BRA FITTING HELP
Check out our bra measuring guide to help you measure for a bra. Take time to measure yourself properly. If you would like help with measuring we can talk you through our guide to help you find your size, so give our friendly team a call on 01439 798388.
Visit our bra fitting guide which offers hints and tips for making sure your bra fits properly. Here you will also find answers to many of the most common bra fitting questions, as well as our collection of bra advice blogposts.
We offer bra fitting appointments here in North Yorkshire. Give us a call on 01439 798 388 and we can arrange a day for you. Our bra fitting specialists are here to help! Offering friendly and supportive advice to help you choose a well fitting and comfortable bra. Our team can help you to find the perfect fit from the wide range of bras and underwear we have available.
Whether you're in need of a complete wardrobe refresh and those comfortable everyday bras, or looking for something special for an upcoming occasion or holiday, we will have something to suit you, whatever your size and budget.
We are happy to advise about sizing and to give bra recommendations so please give us a call on 01439 798388. If you measure yourself and get your overbust and underbust measurement we can advise about your bra size and make specific bra recommendations for you from our collection of leading bra brands.
If you would like any help finding a well fitting and comfortable bra then please give our friendly team of bra specialists a call on 01439 798388 or email us here, we will be happy to help.
Also visit our bra fitting guide, our handy bra measuring guide, our useful size guide page with size charts for bras, briefs and nightwear and our blog for advice, tips and recommendations. We are here to help you find your perfect fit!
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Blogpost last updated by Francesca 13/03/2025 and Sara 25/03/2025.