If you are going to São Paulo or Rio de Janeiro on business, you will need the same business attire you would wear in the U.S. and European cities. For men; suits and ties, and for women; suits for daywear and cocktail dresses or other suitable dinner clothes. For sightseeing and leisure, causal clothing and good waking shoes are both desirable and appropriate. Formal clothes are rarely required, even for evenings. With a few fancier exceptions, dress in São Paulo and Rio's eateries is almost always causal. For beach vacations, you will need lightweight sportswear, a bathing suit, a sun hat, and sunscreen.