Bra size has two measurements; the band (rib cage) and the cup (bust).
Cup size does not represent breast size but instead represents the difference between the rib cage and the bust.

How to Measure Bra Size

Band Size

The band size is measured numerically e.g. 30, 32, and 34…etc. and refers to the size of the rib cage.

Cup Size

The cup size is measured alphabetically e.g. A, B, C, D, DD, E, F… etc. and refers to the size of the breasts in relation to the rib cage i.e.how much bigger the breasts are than the rib cage.

Bra Sister Sizes

Bra sizes that are the same in volume are often referred to as “sister sizes”. The grey cells in the table below demonstrate how the sizes diagonally adjacent from the top right to the bottom left are the same in breast volume i.e. the same volume of breast tissue spread across different size rib cages (band sizes).

Sister sizes demonstrate that cup size doesn’t indicate breast size but instead the difference between the breasts and rib cage. If someones rib cage gets larger but their breasts stay the same, they’ll need a larger band and a smaller cup, demonstrating that the difference between their breasts and rib cage has decreased. For example, if someone usually wears a 26H bra and gains weight around just their middle and not their breasts they may need a 28GG instead; the same volume as a 26H but on a larger rib cage.

Bra sizes can be confusing and so if you try on a bra that fits your breasts very well but doesn’t fit in the band then simply remember that:

  • If you need a smaller band go up in the cup
  • If you need a larger band go down in the cup
26A26B26C26D26DD26E26F26FF26G26GG26H26HH
28A28B28C28D28DD28E28F28FF28G28GG28H28HH
30A30B30C30D30DD30E30F30FF30G30GG30H30HH
32A32B32C32D32DD32E32F32FF32G32GG32H32HH
34A34B34C34D34DD34E34F34FF34G34GG34H34HH
36A36B36C36D36DD36E36F36FF36G36GG36H36HH
38A38B38C38D38DD38E38F38FF38G38GG38H38HH
40A40B40C40D40DD40E40F40FF40G40GG40H40HH
42A42B42C42D42DD42E42F42FF42G42GG42H42HH

Why Buy From Us?

Katherine Hamilton is a UK brand of luxury large cup lingerie in sizes 26-38, D-HH.  We designed and developed our own custom underwires to ensure comfort whilst providing our trademark shape of forward projection and lift with a rounded silhouette.

Designed to empower women with elegance, comfort and confidence, Katherine Hamilton lingerie is an investment in vintage style and luxury.

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