What did athletes wear during competition in ancient Greece?

The Ancient Olympics were held at Olympia, one of the sacred places of the ancient god Zeus. The earliest known record of an Olympic competition is 776 BCE but it is thought that some kind of event may have been held for many years before that. Women did not compete in the ancient Olympics and married women were not even allowed to attend as spectators. The male athletes did not wear any clothes and competed naked. At the first Olympic Games in 776 BCE, there was just one event – the Stade – a 200-meter (222 yards) race.

Source: History in the net