G Cup One Piece Swimsuits

G cup one-piece swimsuits with real encapsulated support — deep underwired cups and full coverage that holds a fuller bust in place, from the brands that engineer swim for this size. Sizes 6 to 20.

G Cup Swimwear | G Cup Bras | Onepiece Swimwear | Plus Size Swimwear
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Rosa Faia Elouise Zip Front Swimsuit BlackRosa Faia Swimwear - Swimsuit Rosa Faia Elouise Zip Front Swimsuit Black
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Rosa Faia Elouise Zip Front Swimsuit Black
Sale price $159.95
Regular price $159.95 Sale price $149.95
Panache Spirit Rita Plunge Swimsuit BlackPanache Spirit Rita Plunge Swimsuit Black
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Panache Spirit Rita Plunge Swimsuit Black
Sale price $189.95
Sale price $189.95
Sale price $189.95
Freya Freestyle UW Moulded Swimsuit Astral NavyFreya Freestyle UW Moulded Swimsuit Astral Navy
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Freya Freestyle UW Moulded Swimsuit Astral Navy
Sale price $134.95
Panache Gingham Paloma Full Cup Swimsuit Blacksg-10-12 Panache Gingham Swimsuit
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Panache Gingham Paloma Full Cup Swimsuit Black
Sale price $169.95
Regular price $164.95 Sale price $129.95
Sale price $169.95
Panache Signature Zadie Full Cup Swimsuit BlackPanache Signature Zadie Full Cup Swimsuit Black
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Panache Signature Zadie Full Cup Swimsuit Black
Sale price $174.95
Fantasie Swimwear - Swimsuit Fantasie Ottawa Twist Front Swimsuit InkFantasie Swimwear - Swimsuit Fantasie Ottawa Twist Front Swimsuit Ink
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Fantasie Ottawa Twist Front Swimsuit Ink
Sale price $154.95
Sale price $154.95
Fantasie Beach Waves Twist Front Swimsuit Bright FuchsiaFantasie Beach Waves Twist Front Swimsuit Bright Fuchsia
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Fantasie Beach Waves Twist Front Swimsuit Bright Fuchsia
Regular price $149.95 Sale price $134.95
Panache Aurora Lara Plunge Swimsuit RedPanache Aurora Lara Plunge Swimsuit Red
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Panache Aurora Lara Plunge Swimsuit Red
Regular price $189.95 Sale price $174.95
Fantasie Swimwear - Swimsuit Fantasie Ottawa Twist Front Swimsuit BlackFantasie Swimwear - Swimsuit Fantasie Ottawa Twist Front Swimsuit Black
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Fantasie Ottawa Twist Front Swimsuit Black
Sale price $154.95
Sale price $154.95
Rosa Faia Elouise Zip Front Swimsuit Passion PinkRosa Faia Elouise Zip Front Swimsuit Passion Pink
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Rosa Faia Elouise Zip Front Swimsuit Passion Pink
Regular price $159.95 Sale price $149.95
Sale price $159.95
Panache Spirit Rita Plunge Swimsuit CobaltPanache Spirit Rita Plunge Swimsuit Cobalt
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Panache Spirit Rita Plunge Swimsuit Cobalt
Sale price $189.95
Sale price $189.95
Sale price $189.95
Primadonna Delray Full Cup Control Swimsuit BlackPrimadonna Delray Full Cup Control Swimsuit Black
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Primadonna Delray Full Cup Control Swimsuit Black
Sale price $299.95
Panache Gingham Paloma Full Cup Swimsuit Red GinghamPanache Gingham Paloma Full Cup Swimsuit Red Gingham
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Panache Gingham Paloma Full Cup Swimsuit Red Gingham
Sale price $169.95
Regular price $164.95 Sale price $129.95
Sale price $169.95
Panache Spirit Rita Plunge Swimsuit RedPanache Spirit Rita Plunge Swimsuit Red
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Panache Spirit Rita Plunge Swimsuit Red
Sale price $189.95
Sale price $189.95
Sale price $189.95
Panache Signature Serena Square Neck Swimsuit BlackPanache Signature Serena Square Neck Swimsuit Black
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Panache Signature Serena Square Neck Swimsuit Black
Sale price $189.95

At G cup, a one-piece needs genuine encapsulation — each side of the bust supported in a deep, structured, underwired cup rather than compressed flat across. Done right, it gives the security of a bra with the coverage of a swimsuit.

What to look for at G cup

Prioritise underwired construction over soft shelf linings, with side support panels to stop the bust migrating outward when you're active. Adjustable straps matter at this size — a small change in strap length has a big effect on how the cup sits.

Brands

Elomi Swim is the most reliable at G cup and above, with Panache Swim and Prima Donna Swim adding further options. Prefer a two-piece? See G cup bikinis and all G cup swimwear.