C Cup Bras – Brands That Make C Cups & How to Find Your Size
Shopping for a UK C cup should be straightforward, but many people still find bra sizing confusing, especially when comparing brands, band sizes and international cup letters online. This guide focuses specifically on C cup bras, including which brands commonly offer C cups, how UK cup sequences work, and how to confirm your correct size before buying.
To confirm your starting size, begin with our Bra Size Calculator, then use the brand information below to shop with confidence.
Who This Guide Is For
- Women who wear a UK C cup
- Shoppers who find the same C size fits differently across brands
- Those moving up from B or comparing C with D cup sizes
- Anyone comparing UK and international sizing
- People who want clearer guidance before buying everyday C cup bras
Why Not All C Cup Bras Are the Same
Although C cup is a recognised UK bra size, bras can still vary in fit across brands and styles. This is not because the basic sizing rule changes, but because a bra size is made from both the band size and the cup size.
In UK sizing, C sits between B and D in the cup sequence: AA, A, B, C, D, DD, E, F, FF, G, GG, H, HH, J, JJ, K.
This means a 30C, 34C and 40C do not all have the same cup volume. The cup letter stays the same, but the overall cup capacity increases as the band size increases.
How Big Is a C Cup?
A UK C cup bra sits one cup size above a B cup and one cup size below a D cup in the UK bra size sequence. However, how large a C cup appears depends on factors such as band size, body proportions and bra design.
For example, a 30C and a 40C 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.
C Cup Size Progression
A C cup sits between B and D in the UK bra size sequence. The diagrams below show how cup volume increases gradually while the band size remains the same.
C sits between B and D in the UK bra size sequence.
34B
34C
34D
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 34D has more cup volume than a 34C, while a 34B 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 band size. This rule applies across all UK brands, regardless of whether they use a traditional or extended cup letter sequence.
The difference between brands is usually the lettering used, not the size step itself. For example, many fuller-bust brands include additional double letters such as FF and GG, while C remains a standard UK cup size used across both traditional and extended cup sequences.
UK vs US Bra Sizes
Bra sizing systems vary slightly between regions. Most UK lingerie brands follow the UK cup size sequence, where C sits between B and D.
Some US brands use different cup lettering conventions, 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 C Cup the Same as a US C Bra Size?
Often, yes. Many UK and US brands use the same C cup lettering, meaning a C cup is frequently labelled the same in both systems.
However, sizing conventions can vary between manufacturers and regions. For this reason, always check the brand’s stated sizing system rather than relying on the cup letter alone.
UK Brands That Make C Cup Bras
C cup bras are available across a wide range of UK lingerie brands, from everyday collections to specialist fuller-bust ranges. The brands below all offer verified UK C cup availability and provide a useful starting point when comparing styles, band sizes and sizing systems.
- Freya – Bands 28–42, cups B–K View size guide
- Fantasie – Bands 30–44, cups B–JJ View size guide
- Triumph – Bands 30–50, cups A–K View size guide
- Wonderbra – Bands 30–40, cups A–G View size guide
- Playtex – Bands 32–46, cups B–F View size guide
C Cup Band Sizes by Brand
Based on confirmed brand availability tables, these are the UK band sizes currently available in C cup sizes across selected lingerie brands. Availability may still vary by individual style and collection.
- Freya: 30C, 32C, 34C, 36C, 38C, 40C
- Fantasie: 30C, 32C, 34C, 36C, 38C, 40C, 42C, 44C
- Triumph: 30C, 32C, 34C, 36C, 38C, 40C, 42C, 44C, 46C, 48C, 50C
- Wonderbra: 32C, 34C, 36C, 38C, 40C
- Playtex: 32C, 34C, 36C, 38C, 40C, 42C, 44C
C Cup Volume Changes With Band Size
Many people assume that all C cups are the same size. In reality, cup volume increases as band size increases. A 38C holds more volume than a 34C, while a 30C holds less.
The cup letter stays the same, but overall cup volume increases as the band size increases.
30C
34C
38C
These simplified educational diagrams show how cup volume changes as the band size increases, even when the cup letter remains C.
A bra size consists of both the band size and cup size. A 38C holds more cup volume than a 34C, while a 30C holds less, despite all three using the same cup letter.
Popular Underwired C Bras (UK Sizing)
These popular underwired C bras are available in UK sizing from well-known lingerie brands including Triumph and Fantasie. Underwired bras are one of the most widely available C bra styles and are commonly chosen for everyday wear across a wide range of band sizes. Before purchasing, we recommend confirming your size using our Bra Size Calculator and reviewing our Bra Fitting Advice guide.
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How to Find Your Correct C Cup Size
Measure your underband and bust, then enter your details into our Bra Size Calculator to get a recommended UK starting size.
For step-by-step measuring guidance and fit checks, use our Bra Fitting Advice.
Common Fit Issues for C Cup Bras
- Band riding up at the back
- Cups gaping at the top edge or neckline
- Spillage at the top edge or sides
- Wires sitting on breast tissue at the sides
- Straps digging in or slipping off
If your C cup fit feels inconsistent, try another style within the same brand or compare brands using our Bra Size Converter.
Popular Non-Wired C Bras (UK Sizing)
These popular non-wired C bras are available in UK sizing from well-known lingerie brands including Triumph and Glamorise. Non-wired bras (sometimes called wireless bras) are a common alternative to traditional underwired styles and are widely available across C cup sizes and larger band sizes. If you are still confirming your size, use our Bra Size Calculator and review our Bra Fitting Advice guide before purchasing.
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Can I Sister Size Instead of Wearing a C 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 if you go down a band size, you usually need to go up a cup size. However, sister sizes can change where wires sit and how the bra supports you, especially across different shapes.
C Cup Sister Size Example
When sister sizing, the band size changes while the cup volume stays similar. A common example is:
These sizes have a similar cup volume, but different band lengths.
Sister Size Comparison
30D
32C
34B
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 C Cup Guides
If you want to compare C cup sizes in more detail, these related guides can help you understand volume, band size and nearby cup sizes.
C Cup Bra FAQs
Is C an average bra size?
C is a common cup size, but there is no single average bra size. A bra size combines both a band size and a cup size, so overall breast volume depends on the complete bra size rather than the cup letter alone.
What is the difference between B and C?
In UK bra sizing, C is one cup size larger than B and one cup size smaller than D. The sequence progresses B, C, D, DD, E, F and beyond.
What does C mean in bra sizing?
C is a standard UK cup size that sits between B and D. A bra size combines both a band size and a cup size, so a C cup can represent different volumes depending on the band size it is paired with.
Is a UK C cup the same as a US C cup?
Often, yes. Many UK and US brands use the same C cup lettering, meaning a C cup is frequently labelled the same in both systems. However, sizing conventions can vary between manufacturers and regions.
Does band size affect C cup volume?
Yes. Cup volume increases as band size increases. A 38C holds more volume than a 32C, even though the cup letter remains the same.
What cup size comes after C?
In the UK bra size sequence, D comes after C. The sequence continues C, D, DD, E, F, FF, G and beyond.
For general background on bra sizing systems and cup progression, see the bra size reference on Wikipedia .