The largest bra cup size available on the market is a K cup. This size is available in some brands such as Freya, Paramour, Elomi, Elila and Comexim. K cup bras provide an unprecedented level of support and coverage for larger bust sizes.
In terms of what size that actually translates to, it depends on the band size. As an example, a K cup would be equivalent to a 36 in a US sizing or a 95 in a European sizing.
Finding the correct size for a K cup can be tricky and it really is a case of trial and error as every body is different. To ensure the best fit, you should get fitted at a lingerie boutique or department store in your area.
It is worth noting that K cup bras are becoming increasingly easier to come by. As larger bust sizes become increasingly popular, more and more brands are offering a range of K cup sizes.
Also, if you are looking for a K cup bra, look out for bras with 'cut & sew' or '3-part' cups as these provide the maximum support for a larger bust size. You can find examples of this type of bra here: [INSERT LINK]
Ultimately, wear what makes you feel comfortable, confident and beautiful.