In Canada, the sizes run D, DD, DDD, F, G, H, J, K, K, M, and N cup! In Australia, New Zealand, and the UK we use the whole gamut of cup sizes in bras – D, DD, E, F, FF, G, GG, H, HH, J, JJ, and K cup bras. In Europe, the sizes are D, E, F, G, H, I and J cup, so you can see how confusing it can be.

Here at Storm in a D Cup we have tried and testing different methods of labelling the bras and come to a few conclusions. One is, that bra fitting is indeed Rocket Science (and it takes about 2 years to get a degree). The other is that for your favourite brands like Simone Perele and Prima Donna, where you are likely to keep buying lingerie online from these brands, we have kept the cup sizes as they are. So if your label says I cup, then go ahead and buy an I cup bra online.

The only time we made an exception to this rule is for Corin bras which is a Polish lingerie brand. For Corin bras, we have converted their cup sizes to your regular cup sizes, so the size on the swing ticket may not be the size written on the fabric tag inside. You can read more about them here, but for the purposes of buying I cup bras online, the main brand that offers this size is PrimaDonna. If you have never tried a PrimaDonna bra, it’s a real experience. They have been making lingerie since 1865, so that’s more than 150 years! PrimaDonna has positioned itself as one of the best brands offering plus size lingerie. They are experts in designing perfect-fitting luxury lingerie for naturally curved women who just happen to also take a large cup. They carry I cup fittings and J cup fittings in some of their styles and go up to Canada back size 46.

PrimaDonna gives women excellent support in an I cup, and is the result of a combination of their expertise and relentless striving for improvement and perfection. In 2010 PrimaDonna launched PrimaDonna Twist, which is aimed at a younger woman. It’s a more fun, sister brand, with more moulded cups, young styles and interesting prints. Did you know you can also buy I cup swimwear online? We carry a range of PrimaDonna swimwear all year round so you can buy your plus sized swimsuit online, your big cup bikini online, even your large cup tankini online, in summer and in winter…and rest assured that you can return it for exchange or refund with our generous returns policy if you don’t like it.