Why do cup sizes vary between UK bra brands?

All UK bra sizing follows the same 1-inch rule, but brands use different cup letter sequences. This means the same cup letter can represent different volumes depending on the brand.

Does band size affect cup volume?

Yes. Cup volume increases as band size increases, so a 38 cup holds more volume than the same cup letter on a smaller band.

Is UK bra sizing the same as US or EU sizing?

No. UK, US and EU sizing systems use different cup progressions. Always use a conversion chart when comparing sizes across regions.

Bra Size Guides

LL Cup Bras – UK LL Cup Sizes, Brands & Fit Guidance

A UK LL cup is one of the largest cup sizes currently produced in UK bra sizing. Only a very small number of specialist brands manufacture LL cups, making them extremely difficult to find.

This guide explains what an LL cup means in UK sizing, which brands make it, and how to approach fit when options are limited.

To confirm your starting size, begin with our Bra Size Calculator.

Who This Guide Is For

Women who wear a UK LL cup
Those sized out of L and KK cup ranges
Customers struggling to find any ready-to-wear bras
Fuller-bust shoppers needing maximum support

Why LL Cup Bras Are So Hard to Find

LL cup bras are difficult to find because they sit at the very top end of UK cup size production. Only a handful of brands design patterns, wires and support structures capable of safely supporting this cup volume.

At LL cup level, bras require:

Exceptionally deep cups
Wider and stronger underwires
Heavily reinforced bands
Specialist grading beyond standard size ranges

Because demand is small and production costs are high, most brands stop at K, KK or L cups. As a result, LL cup wearers often have access to only one or two styles at any given time.

Why LL Cup Bras Are Different

Unlike smaller cup sizes, UK LL cups are only produced using the extended UK cup sequence. There is no alternative traditional or retailer-specific LL cup sizing.

This means all UK LL cup bras represent the same cup volume. Differences in fit come from band size, cup shape and construction — not from how the size itself is defined.

The extended UK cup sequence is: D, DD, E, F, FF, G, GG, H, HH, J, JJ, K, KK, L, LL.

How Cup Sizes Are Actually Measured

All UK bra sizing follows the 1-inch rule. Each step in the cup sequence represents a one-inch increase in the difference between the underband and the fullest bust measurement.

At LL cup level, correct fit depends far more on band firmness, wire shape and overall construction than on the cup letter alone.

Important:
An LL cup is not one fixed volume. Cup volume increases as band size increases, so a 32LL and 38LL are very different in fit and capacity.

Always consider both band size and cup size together.

UK Brands That Make LL Cup Bras

Elomi – Bands 32–38, extremely limited specialist styles View size guide

LL Cup Band Sizes by Brand

Elomi: 32LL, 34LL, 36LL, 38LL

Related Cup Size Guides

For background on UK bra sizing systems, see the bra sizing reference on Wikipedia .