A little clarity. A more comfortable fit. Independent US & UK sizing guides

G Cup Bra Shape and Style Guide

Use observations from a bra you have tried to choose the next construction feature worth comparing.

What this tool does

Cup depth, upper-edge shape and wire width can matter independently of cup letter. You do not need a definitive body-shape label to begin.

Cup depth, edge and wire-width matcher

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Your cup depth, edge and wire-width matcher result

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How this tool reaches its result

Combine three supported-garment observations into construction features to compare. No size is inferred from an appearance category.

A tool result cannot guarantee garment fit.

Site calculation methods →

Projection and cup depth

Explore: Projection and cup depth
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If a cup is pushed down despite a stable band, investigate room near the base and wire position. A seamed cup can offer a useful comparison to a moulded shape, but construction varies within both categories.

Fullness and cup edges

Explore: Fullness and cup edges
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A closed top edge may cut in; a tall or open cup may leave space. Stretch fabric or a different neckline can change that interaction without requiring a different band.

Keep observations provisional

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Shape can look different when supported and unsupported. Use the tool to choose features to compare, not to assign a permanent category or calculate a new size from appearance.

Use garment behaviour instead of a fixed body category

Explore: Use garment behaviour instead of a fixed body category
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Two bras in the same label can put their available room in different places. One may provide more room near the wire, another more height above it. If the wire slides downward while the upper cup remains empty, note both observations before choosing the next construction.

A stretch upper panel may accommodate an uneven upper edge; a lower cup can reduce unused height. Neither feature is a guarantee. Compare one construction change at a time and keep the band reasonably stable so you can understand which difference helped.

Asymmetry and changing fit

Explore: Asymmetry and changing fit
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It is possible for one side to fit differently from the other. Compare containment on both sides and use strap adjustment gently rather than pulling one side into place. A removable insert or adaptable cup fabric may be useful depending on the garment and your preference.

The shape tool does not assign a permanent identity. Its output is a list of garment features worth investigating based on the fit observations you enter. Revisit those observations when you change activity, construction or size.

How to interpret your cup depth, edge and wire-width matcher result

Explore: How to interpret your cup depth, edge and wire-width matcher result
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Select the situation that matches you to see the check relevant to this section.

Combine three supported-garment observations into construction features to compare. No size is inferred from an appearance category.

A tool result cannot guarantee garment fit.

The requested inputs are near the cup base, upper cup edge, wire at the sides. Keep the unit or chart context with the result. Blank inputs are not treated as zero, and unsupported values should be corrected rather than used to produce a convenient-looking answer.

Keep depth, edge and width as separate observations

Explore: Keep depth, edge and width as separate observations
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Select the situation that matches you to see the check relevant to this section.

A narrow wire does not necessarily imply a shallow cup, and a tall cup does not prove that it has room at the base. Describe where pressure occurs and where space remains. The shape tool asks separate questions because those features can vary independently.

Start with a stable band so its movement does not obscure the cup observation. If the wire slips below the crease while the top gaps, compare cup depth and height. If the cup edge contains but the wire extends uncomfortably far to the side, compare wire shape while preserving the useful containment.

The output is a shortlist of construction features, not a permanent body classification. A different bra can reveal a different aspect of the fit. Reassess after changing construction and keep the exact garment model with your notes so the observation remains interpretable.

Common questions

Can the shape finder diagnose projection from my measurements?
A narrow wire does not necessarily imply a shallow cup, and a tall cup does not prove that it has room at the base. Describe where pressure occurs and where space remains. The shape tool asks separate questions because those features can vary independently.
What should I record when using this guide?
Start with a stable band so its movement does not obscure the cup observation. If the wire slips below the crease while the top gaps, compare cup depth and height. If the cup edge contains but the wire extends uncomfortably far to the side, compare wire shape while preserving the useful containment.
What does this result leave unresolved?
The output is a shortlist of construction features, not a permanent body classification. A different bra can reveal a different aspect of the fit. Reassess after changing construction and keep the exact garment model with your notes so the observation remains interpretable.

Sources & method

The source names below identify the chart and fitting references used. Worked examples use our documented independent method; they are not product tests or fit guarantees.

  • Freya international label chart
  • Bravissimo fitting guide

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