Looking for the best bras for 40AA? A UK 40AA combines a 40 band with an AA cup. Although 40AA is stocked by fewer retailers than many more common bra sizes, bras in this size are available from selected brands and online retailers.
The best bras for 40AA will depend on the coverage, neckline and cup construction you prefer. Different bra designs can provide different levels of coverage and shaping, so it is useful to check the individual product description before choosing a style.
Before buying a 40AA bra, it can help to check the equivalent international sizes, sister-size relationships and visual size comparison. The quick tools on this page show how 40AA compares across different sizing systems and related UK bra sizes.
You can confirm your starting size with our Bra Size Calculator, check fit problems in our Bra Fitting Advice, or compare brand labels using the Bra Size Converter.
For more detail on this cup size, see our AA Cup Bras Guide, How Big Are AA Cups?, and AA vs A vs B Cup Size Comparison.
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When looking for the best bras for 40AA, the choice is more limited than in many more widely stocked band-and-cup sizes. The Naturana Cotton Wireless Bra provides an Amazon option in 40AA, while Ample Bosom also currently stocks Anita bras in this size.
40AA Options at a Glance
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The Naturana Cotton Wireless Bra is available in 40AA and provides a non-wired option for everyday wear. It is available in beige and white, although current colour and size availability can vary.
Ample Bosom 40AA Bras
Ample Bosom: Browse 40AA Bras at Ample Bosom . The current 40AA selection includes Anita bras. Product and colour availability can change, so check the retailer's current listings before ordering.
Quick sizing reminder for 40AA:
Because 40AA is a less widely stocked band-and-cup size, available constructions and individual products can vary between retailers and collections. Check the listed size range, product construction and current colour availability before ordering.
If you need to compare equivalent sizes between different sizing systems, use our Bra Size Converter.
Recheck your measurements using the Bra Size Calculator and review band, wire and cup positioning in our Bra Fitting Advice.
When trying a 40AA bra, check the band, cups, wires and straps together rather than judging the fit from the cup letters alone.
If one or more of these points does not look or feel right, use our Bra Fitting Advice for more detailed troubleshooting.
The best bras for 40AA are available in a relatively limited range of constructions. The Naturana Cotton Wireless Bra shown above provides a non-wired 40AA option made from cotton, with embroidery on the cups and soft ribbed fabric.
When comparing bras in 40AA, check the individual product description for the cup construction, materials, available colours and current size availability before ordering.
Non-wired bras provide shaping and coverage without an underwire. The Naturana Cotton Wireless Bra shown above is a non-wired option available in 40AA.
The Naturana option uses a 100% cotton soft-cup construction. Cotton soft-cup bras are one of the available constructions to consider when looking for a bra in 40AA.
The Naturana Cotton Wireless Bra includes embroidery on the cups and soft ribbed fabric. These are product-construction details rather than sizing features, so check the current product listing for available colours and specifications.
A 40AA combines a 40 band with an AA cup. Bra cup letters cannot be considered independently from the band because cup volume changes as the band measurement changes.
In the UK cup sequence, this part of the progression runs: AA → A → B → C → D → DD → E. This places AA immediately below A.
Remember that bra size combines band size and cup size. A 40AA has less overall cup volume than a 44AA even though both sizes use the same AA cup letters.
The nearest smaller-band sister size to 40AA is 38A. This size has a similar cup volume but uses a smaller band measurement. You can learn more about equivalent-volume sizing in our Bra Sister Sizes Explained guide .
The appearance of a 40AA can vary because breast shape, tissue distribution, torso proportions and bra construction all affect how the same bra size looks.
Because bra sizing combines both band size and cup size, an AA cup does not represent one fixed breast volume. For example, a 40AA has a smaller overall cup volume than a 44AA even though the cup letters are the same.
For visual examples across different AA-cup band sizes, visit our How Big Are AA Cups? guide.
You can also use the UK Bra Size Visual Comparison Tool to compare 40AA with other manufactured UK bra sizes.
A 40AA combines a 40 band with an AA cup, which is one of the smaller cup sizes in the UK bra sizing sequence. However, bra size combines both band and cup size, so the cup letters should not be considered on their own.
The nearest smaller-band sister size to 40AA is 38A. This size has a similar cup volume but uses a smaller band measurement.
Bra sizing systems can vary between brands and countries. Use our Bra Size Converter and check the individual brand's sizing information before ordering.
Yes. The Naturana Cotton Wireless Bra shown above is a non-wired option available in 40AA. Current colour and size availability can vary.
The Naturana option shown above is a non-wired cotton soft-cup bra available in 40AA. It features embroidery on the cups and soft ribbed fabric. Ample Bosom also currently stocks Anita bras in 40AA. Check the current product listings for available colours, constructions and specifications before ordering.
Compare 40AA with the same cup letters on nearby band sizes using the AA-cup buying guides below.
Browse our Best Bras by Size directory to explore buying guides for currently manufactured UK bra sizes. Find your exact band-and-cup size or discover other published buying guides across the UK size range.
A well-fitting 40AA should have a secure, level band and cups that sit smoothly against the breast tissue without gaping, wrinkling or overflow. In a non-wired style, the cups should sit smoothly against the breast tissue and the band should remain level around the body.
Use the Naturana product and Ample Bosom retailer option above as starting points when choosing the best bras for 40AA, then check the product's sizing system, construction, colour options and current size availability before ordering.
Need help confirming your size? Use the Bra Size Calculator, explore equivalent-volume sizing with the Bra Sister Size Calculator, and follow our Bra Fitting Advice.
You can also compare sizing systems using the Bra Size Converter or compare 40AA visually with other sizes using the UK Bra Size Visual Comparison Tool.
