GG Cup Bras – Brands That Make GG Cups & How to Find Your Size
Finding supportive bras in a UK GG cup can be frustrating, especially as many mainstream brands do not manufacture this size. This guide explains what GG cup means in UK sizing, which brands make it, and how to confirm your correct fit before buying.
To confirm your starting size, begin with our Bra Size Calculator, then compare sizing differences between brands using our Bra Size Converter.
Want to browse GG cup bras by band size? Visit our GG Cup Bras by Band Size page to jump straight to sizes like 32GG, 34GG, 36GG and more.
Who This Guide Is For
- Women who wear a UK GG cup
- Those sized out of high-street brands
- Fuller-bust shoppers needing dependable everyday support
- Anyone confused by GG vs G or FF sizing
- Customers repeatedly sister-sized due to limited availability
Why Not All GG Cup Bras Are the Same
The GG cup is part of the extended UK bra size sequence used by many fuller-bust lingerie brands. While GG is a recognised UK bra size, some brands use different cup lettering systems, which can make size comparisons confusing.
In extended UK sizing, GG sits between G and H. Some traditional cup sequences move directly from G to H instead, which is why checking the brand's sizing system is important when comparing bra sizes.
The GG cup is one of the double-letter sizes used in UK bra sizing. Double cups such as FF, GG and HH are additional cup size steps rather than half sizes. For a full explanation, see our Double Cup Bra Size Guide .
If you are comparing neighbouring cup sizes, see our guide explaining G vs GG vs H cup size differences .
How Big Is a GG Cup?
A UK GG cup bra sits within the fuller-bust range of the UK cup size sequence. However, how large a GG cup appears depends on factors such as band size, body proportions and bra design.
For example, a 30GG and a 40GG do not have the same cup volume. Cup volume increases as band size increases, which is why the cup letter alone does not tell the full story.
If you would like to see visual examples across different band sizes, visit our How Big Are GG Cups? guide.
GG Cup Size Progression
A GG cup sits between G and H in the extended UK cup size sequence used by many fuller-bust brands. The diagrams below show how cup volume increases gradually while the band size remains the same.
GG sits between G and H in the UK bra size sequence.
These simplified educational diagrams show how cup volume increases across nearby UK cup sizes when the band size stays the same.
Cup volume increases gradually across the UK sizing system. A 34H has more cup volume than a 34GG, while a 34G has slightly less.
How cup sizes actually work: Bra cup sizes are based on a simple fitting rule — each step in the cup sequence represents a 1 inch difference between the bust and underbust measurement. This rule applies across all UK brands, regardless of whether they use a traditional or extended cup letter sequence.
In brands that use an extended UK cup sequence, GG is a separate cup size positioned between G and H. Each step represents the same one-inch increase in measurement difference, making GG one cup size larger than G and one cup size smaller than H.
The difference between brands is the lettering used, not the size step itself. For example, some traditional UK cup sequences move directly from G to H, while extended UK sizing includes GG as an additional cup size between them.
UK vs US Bra Sizes
Bra sizing systems vary slightly between regions. Most specialist fuller-bust brands such as Panache, Freya, Fantasie and Elomi follow the UK cup size sequence, which includes double letters such as FF, GG and HH.
Some US brands use a slightly different lettering system, which can create confusion when comparing sizes internationally. To understand how the sizing systems relate, see our UK vs US bra size comparison guide .
Is a UK GG Cup the Same as a US GG Bra Size?
It depends on the brand. Many UK-based fuller-bust brands such as Panache, Freya and Elomi use the same extended UK cup sequence internationally, meaning an GG cup is labelled the same in both the UK and US.
However, some US lingerie brands follow a different cup progression. For this reason, always check the brand’s stated sizing system rather than relying on the cup letter alone.
A cup size is not one fixed volume. Cup volume increases as band size increases, so a 32GG, 36GG and 44GG are all very different in capacity, even though the cup letter is the same.
Always consider both band size and cup size together.
UK Brands That Make GG Cup Bras
- Bravissimo – Bands 28–40, cups D–L View size guide
- Freya – Bands 28–42, cups B–K View size guide
- Panache – Bands 28–46, cups B–K View size guide
- Elomi – Bands 32–48, cups B–LL View size guide
- Sculptresse – Bands 34–46, cups D–K View size guide
GG Cup Band Sizes by Brand
- Bravissimo: 28GG, 30GG, 34GG, 36GG, 38GG, 40GG
- Freya: 28GG, 30GG, 32GG, 34GG, 36GG, 38GG, 40GG, 42GG
- Panache: 28GG, 30GG, 32GG, 34GG, 36GG, 38GG, 40GG
- Elomi: 32GG, 34GG, 36GG, 38GG, 40GG, 42GG, 44GG, 46GG
- Sculptresse: 34GG, 36GG, 38GG, 40GG, 42GG, 44GG, 46GG
GG Cup Volume Changes With Band Size
Many people assume that all GG cups are the same size. In reality, cup volume increases as band size increases. A 38GG holds more volume than a 34GG, while a 30GG holds less.
The cup letter stays the same, but overall cup volume increases as the band size increases.
These simplified educational diagrams show how cup volume changes as the band size increases, even when the cup letter remains GG.
A bra size consists of both the band size and cup size. A 38GG holds more cup volume than a 34GG, while a 30GG holds less, despite all three using the same cup letter.
Popular GG Cup Bras (UK Sizing)
Below are selected GG cup bras in UK sizing from fuller-bust specialist brands. These examples show styles commonly available in GG cup sizes across a range of band sizes. If you are still confirming your size, see the fitting advice and sizing information further down this guide before purchasing.
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How to Find Your Correct GG Cup Size
Measure your underband and fullest bust carefully, then enter your measurements into our Bra Size Calculator to get a recommended UK starting size.
For measuring guidance and detailed fit checks, see our Bra Fitting Advice.
Common Fit Issues for GG Cup Bras
- Band riding up at the back (often means the band is too big)
- Cups gaping (often shape-related, not always “too big”)
- Spillage at the top edge (often means the cup is too small)
- Wires sitting on breast tissue at the sides
- Straps digging in or slipping off
If your GG cup fit feels inconsistent, try another style within the same brand or compare brands using our Bra Size Converter.
Can I Sister Size Instead of Wearing a GG Cup?
Sister sizing can help if your exact size is unavailable in a specific style, but it should be used carefully. If you go up a band size, you usually need to go down a cup size to keep a similar cup volume (and vice versa). However, sister sizes can change where wires sit and how the bra supports you, especially across different shapes.
GG Cup Sister Size Example
When sister sizing, the band size changes while the cup volume stays similar. A common GG cup example is:
These sizes have a similar cup volume, but different band lengths.
Sister Size Comparison
These diagrams provide a simplified visual example of sister sizing. While the band size changes, the overall cup volume remains broadly similar.
Sister sizes can help when your usual size is unavailable. As the band size increases, the cup letter decreases to maintain a similar cup volume.
For a full explanation of how sister sizing works, see our Bra Sister Sizes Guide .
Use our Bra Size Converter to compare UK brand sizing and sister sizes accurately.
Explore More GG Cup Guides
If you want to compare GG cup sizes in more detail, these related guides can help you understand cup volume, band size, sister sizing and neighbouring cup sizes.
- GG Cup Bras by Band Size
- How Big Are GG Cups?
- G vs GG vs H Cup Size Comparison
- Bra Sister Sizes Guide
GG Cup Bra FAQs
Is GG bigger than G?
Yes. In extended UK sizing, GG is one cup step larger than G and one step smaller than H.
Do all brands offer GG cups?
No. GG cup sizes are mainly offered by fuller-bust specialist brands that follow an extended UK cup sequence.
Does band size affect GG cup volume?
Yes. A 40GG holds more volume than a 32GG, even though the cup letter is the same.
Related Cup Size Guides
For background on bra sizing systems and cup progression, see the bra sizing reference on Wikipedia .