The cup size ‘FF’’ is usually associated with UK or Australian brands and can be different to European brands as they do not carry a DD, which means that their G cup is equal to a FF cup in an Australian or UK cup. Although a FF cup is the same in theory, in practical terms one FF cup in one brand could be a whole cup size different in another brand.
It’s important to note that as the back band increases so does the size of the cup. The FF cup of a 16FF is bigger than the FF cup of a 12FF. So in actual fact a 16FF is 2 cup sizes bigger than a 12FF. So, not all FF cups are the same size. The size of the back band actually changes the size of the cup.
Finding a FF cup in a mainstream store is almost impossible. In actual fact, at Brava a FF cup is our biggest selling cup. Many women who believe they are a DD or E cup are more often an F or FF cup because they have not been fitted correctly. We estimate that most women who visit Brava for the first time and tell us they are an FF cup would be closer to a G or GG cup. But remember the bra band could be too big, so when we fit a smaller back band on our customers this decreases the cup size too so then the cup size then must go up to compensate.