J Cup Bras – Brands That Make J Cups & How to Find Your Size
Finding supportive bras in a UK J cup can be challenging, particularly in mainstream and high-street stores where size ranges often stop much earlier. This guide focuses specifically on J cup bras, explaining which brands make them, how cup sizing differs between brands, and how to confirm your correct size before buying.
To find your starting size, begin with our Bra Size Calculator, then explore the specialist brands listed below.
Who This Guide Is For
- Women who wear a UK J cup
- Fuller-bust and fuller-figure customers
- Those sized out of high-street brands
- Shoppers comparing specialist DD+ brands
- Anyone repeatedly sister-sized due to limited availability
Why Not All J Cup Bras Are the Same
Although J cup is a recognised UK bra size, not all J cups represent the same cup volume. This is because different UK cup letter sequences are used by different brands, even though the underlying sizing rule is the same.
Bra cup sizes are determined by the difference between the band size and the fullest bust measurement. Each increase of 1 inch in that difference equals one cup size in the UK sizing system.
The difference between brands is not how the size is calculated, but which letters are used to label each step. Traditional UK brands follow a shorter sequence: B, C, D, DD, E, F, G, H, J, K.
Fuller-bust specialist brands use an extended UK cup sequence that includes additional double letters: D, DD, E, F, FF, G, GG, H, HH, J, JJ, K, KK, L, LL.
Each step in the UK cup size sequence represents a 1 inch increase in the difference between the underband and the fullest bust measurement. This rule applies to all UK brands, regardless of whether they use a traditional or extended cup letter sequence.
The only difference between brands is how those 1-inch steps are labelled. Traditional-sequence brands move directly from H to J, while extended-sequence brands include an additional step labelled HH between H and J. The measurements increase in exactly the same way — only the letters change.
This difference is not related to support, quality or construction. It is simply the result of using different cup letter progressions. Both systems are valid UK sizing methods, but they are not interchangeable by letter alone.
A cup size is not one fixed volume. Cup volume increases as the band size increases, so a 30J, 36J and 44J are all very different in fit and capacity, even though the cup letter is the same.
Always consider both band size and cup size together when comparing bras.
UK Brands That Make J Cup Bras
J cup bras are typically found in fuller-bust specialist brands that offer extended UK cup sizing. The brands below show each brand’s full UK band and cup size range, based on confirmed availability tables.
- Bravissimo – Bands 28–40, cups D–L View size guide
- Elomi – Bands 32–48, cups B–LL View size guide
- Panache – Bands 28–46, cups B–K View size guide
- Sculptresse – Bands 34–46, cups D–K View size guide
- Goddess – Bands 32–56, cups B–K View size guide
J Cup Band Sizes by Brand
- Bravissimo: 28J, 30J, 32J, 34J, 36J, 38J, 40J
- Panache: 28J, 30J, 32J, 34J, 36J, 38J, 40J, 42J, 44J, 46J
- Elomi: 32J, 34J, 36J, 38J, 40J, 42J, 44J, 46J
- Sculptresse: 34J, 36J, 38J, 40J, 42J, 44J, 46J
- Goddess: 34J, 36J, 38J, 40J, 42J, 44J, 46J
Popular J Cup Bras
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How to Find Your Correct J Cup Size
Accurate measurements are essential at J cup level. Measure your underband and bust carefully, then enter your details into our Bra Size Calculator.
For step-by-step measuring guidance and fit checks, visit our Bra Fitting Advice.
Common Fit Issues for J Cup Bras
- Spillage or cutting in at the neckline
- Underwires sitting on breast tissue
- Straps taking too much weight
- Bands riding up or stretching too quickly
- Bras losing support during the day
Specialist fuller-bust brands address these issues using firmer bands, deeper cups and reinforced construction.
Can I Sister Size Instead of Wearing a J Cup?
Sister sizing may work temporarily but is rarely ideal for J cup wearers. Moving up a band and down a cup often reduces support and changes cup shape. If you are consistently sister sizing, it usually means the brand or cup structure is not right for you.
Use our Bra Size Converter to compare UK brand sizing accurately.
J Cup Bra FAQs
Do all brands use the same J cup sizing?
No. While J cup is a recognised UK size, brands use different cup letter sequences.
Traditional brands use a shorter progression, while fuller-bust brands use extended sequences with FF, GG, HH and JJ cups.
As a result, J cups can vary significantly in volume.
Is a UK J cup the same as a US J cup?
No. US sizing uses a different cup structure.
A US J cup is smaller in volume than a UK J cup from extended UK sizing brands.
Always use conversion charts rather than relying on the letter alone.
Can J cup bras be supportive without wires?
Some non-wired styles exist, but most J cup wearers achieve the best lift and long-term support from underwired bras.
Related Cup Size Guides
For general background on bra sizing systems and cup progression, see the bra size reference on Wikipedia .