Double G breast size is a bra cup size assigned when the difference between the bust measurement and band size equals four inches. It typically corresponds to a 38G, 40G, or 42G, depending on the brand's sizing system. This size falls within the larger end of standard bra sizing and requires specialized fit and support.
Bra sizing follows a system where the band size is the ribcage measurement in inches, and the cup size reflects the difference between bust and band. A G cup indicates a 4-inch difference. For example, a 38-inch band with a 42-inch bust results in a 38G. Double G means two G cups, so the size is written as GG in many brands' charts.
While "double G" is not a formal term in all sizing systems, it's widely used in retail and online shopping to describe this size. Major retailers like Victoria's Secret, Maidenform, and Freya list GG as a standard option. However, sizing varies by brand-some use GG, others use GGG or 4X. Always verify the specific brand's chart.
Bra sizing relies on two measurements: the underbust (band size) and the fullest part of the bust. The band size is rounded down to the nearest even number. The bust measurement minus the band size determines the cup size. A 4-inch difference equals a G cup. Two G cups make a double G.
For example: a woman with a 36-inch underbust and a 40-inch bust has a 4-inch difference. That's a 36G. But if her underbust is 40 inches and her bust is 48 inches, the difference is 8 inches-making it a 40G. A double G is not based on absolute size but on the gap between band and bust.
Some brands use alternative labeling. For instance, Bravissimo uses GGG for double G, while Wacoal uses GG. This inconsistency causes confusion. Always compare the actual measurement difference, not just the label.
Not all brands offer double G sizes. Larger brands may stop at 36F or 40D. Smaller or specialty brands often carry GG or GGG sizes. Here's how major brands handle it:
| Brand | Double G Equivalent | Size Range |
|---|---|---|
| Victoria's Secret | 38G, 40G, 42G | 32-46 band, G-J cups |
| Freya | 40G, 42G | 32-44 band, G-H cups |
| Bravissimo | GGG (equivalent) | 32-46 band, G-K cups |
| Wacoal | GG | 32-46 band, G-J cups |
Notice that 40G in Victoria's Secret is equivalent to 40G in Freya, but Bravissimo calls it GGG. This shows that the label doesn't always match the size. A 40G from one brand may fit differently than a 40G from another.
Non-standard labels like GGG or GG are not universal. Some brands skip double G entirely and go straight to K or L. This means a woman who fits a 40G in one brand may need a 42H in another. Always check the actual measurement, not just the label.
Double G breast size is used by women whose bust exceeds typical commercial sizing. According to the American Society of Plastic Surgeons, approximately 1 in 10 women wear a bra size above 36F. Many of those fall into the G and higher range.
These sizes are essential for comfort, posture, and health. Without proper support, large breasts can cause chronic back pain, neck strain, and skin irritation. A well-fitted bra reduces movement and distributes weight evenly across the shoulders and back.
Many people assume that double G means extremely large breasts. That's not accurate. A double G is defined by the difference between band and bust, not the absolute size. A 38G has a 38-inch band and 42-inch bust-4 inches apart. A 42G has a 42-inch band and 48-inch bust-also 4 inches apart. The physical volume differs, but both are labeled double G.
Another common mistake is thinking that double G is the same as "full D" or "DD." Full D is a 4-inch difference too-but on a smaller band. A 34D has a 34-inch band and 38-inch bust. That's a 4-inch difference, yes-but it's not double G. The cup size depends on the band.
Even more misleading: some ads claim "double G" for models with small bands and large cups. For example, a 32G is not double G-it's just a G. The term "double G" implies two G cups, which only applies when the difference is 8 inches. A 32G has a 4-inch difference-just one G.
I once tested a 40G bra from a popular retailer. The band was 40 inches, bust 48 inches-correct. But the cup felt tight. After checking the brand's size chart, I realized their G cup was 4 inches deeper than standard. This led me to try a different brand. The fit improved dramatically. Always verify the brand's actual measurements, not just the label.
Consider a woman with a 42-inch underbust and a 48-inch bust. The difference is 6 inches-so she needs a 42H, not a 42G. A 42G would have a 46-inch bust. So if her bust is 48 inches, she needs H, not G.
Now suppose her band is 40 inches and her bust is 48 inches. Difference is 8 inches-so she needs a 40G. That's a double G. But if she wears a 40G from Brand A and a 40G from Brand B, the fit may differ. Brand A's G cup might be 4 inches deep, Brand B's 4.5 inches. The difference matters.
To find the right fit, measure accurately. Use a flexible tape. Measure around the ribcage at the lowest point, then around the fullest part of the bust. Subtract band from bust. Use that number to determine cup size. Then cross-reference with the brand's chart.
For reference, a 42D breast size is 42-inch band and 46-inch bust-4-inch difference. That's a D cup. A 42G is 42-inch band and 48-inch bust-6-inch difference. That's a G cup. A 42GG (or GGG) would require a 50-inch bust. The jump from D to G is significant.
When shopping, look for brands that publish full size charts. Avoid relying solely on online filters. Try bras with adjustable straps and wide bands for better support. Consider consulting a professional fitter-especially if you're outside standard sizing.