Cups can absolutely be added to a bathing suit! In fact, many bathing suits come with built in cups or the option to add cups. Cups can add both support and coverage to your swimwear. If you are looking for extra support, you may want to consider a bathing suit with an underwire. For additional coverage, you could opt for a one piece swimsuit with cups or a tankini top with cups. No matter what your preference, there are plenty of options available to choose from.