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G cup bras flat-laid — a nude t-shirt bra, a black full-coverage underwire, and a supportive sports bra, on warm linen

G Cup Bras

(59 products)

A G cup bra size is a full-bust size where the cup letter reflects your bust-minus-band difference — in UK sizing it sits one step below GG, two below H. Support comes from the band, not the straps. Shop t-shirt, sports, strapless, minimizer, plunge and nursing G cup bras, 30G to 44G.
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A G cup describes the difference between your underbust and your bust measurement — roughly 9 inches — not an absolute volume. A 32G and a 42G hold very different amounts, which is why the band number matters as much as the letter, and why two people in the same cup can need completely different bras.

Fitting a G cup

At this cup size support comes from structure rather than tightness — three or four hooks, wider side wings to stop the cup pulling forward, and cups seamed in sections rather than moulded from a single piece.

Best G cup styles

Look for side support panels, which push tissue forward and stop it migrating under the arm. Full cup and balconette shapes are the most reliable; for sport, an encapsulation bra that supports each breast separately beats a compression style.

Find your exact size

Browse by band and cup together for a more precise fit — every band from 28 to 48 is available as its own G cup collection.

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