"Among the Lydians, and, indeed, among the barbarians generally, it is considered a deep disgrace, even for a man, to be seen naked." (Herodotus, Book I, Chapter X.)
"The simple dress which is now common was first worn in Sparta, and there, more than anywhere else, the life of the rich was assimilated to that of the people. The Lacedæmonians, too, were the first who, in their athletic exercises, stripped naked and rubbed themselves over with oil. This was not the ancient custom; athletes formerly, even when they were contending at Olympia, wore girdles about their loins [earlier still, the Mycenæans had always worn a loin-cloth], a practice which lasted until quite lately, and still persists among barbarians, especially those of Asia, where the combatants at boxing and wrestling matches wear girdles." (Thucydides, _History_, Book I, Chapter VI.)
"The notion of the women exercising naked in the schools with the men ... at the present day would appear truly ridiculous.... Not long since it was thought discreditable and ridiculous among the Greeks, as it is now among most barbarous nations, for men to be seen naked. And when the Cretans first, and after them the Lacedæmonians, began the practice of gymnastic exercises, the wits of the time had it in their power to make sport of those novelties.... As for the man who laughs at the idea of undressed women going through gymnastic exercises, as a means of revealing what is most perfect, his ridicule is but 'unripe fruit plucked from the tree of wisdom.'" (Plato, _Republic_, Book V.)
According to Plutarch, however, among the Spartans, at all events, nakedness in women was not ridiculous, since the institutes of Lycurgus ordained that at solemn feasts and sacrifices the young women should dance naked and sing, the young men standing around in a circle to see and hear them. Aristotle says that in his time Spartan girls only wore a very slight garment. As described by Pausanias, and as shown by a statue in the Vatican, the ordinary tunic, which was the sole garment worn by women when running, left bare the right shoulder and breast, and only reached to the upper third of the thighs. (M.M. Evans, _Chapters on Greek Dress_, p. 34.)