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
Panache Swim, Fantasie Swim and Prima Donna Swim all make underwired swimsuits at G cup and above. Prefer a two-piece? See G cup bikinis and all G cup swimwear.
