The phrase almost occurs in Athenaeus, Deipnosophists 1.29F-30A (1.54 Kaibel): "Themistocles received as a present from the King [of Persia] Lampsacus for wine, Magnesia for bread, Myus for fish, and Percote and Palaescepsis for bedding and clothing. And he also told him to wear non-Greek garb, like Demaratus, adding Gambreion to the previously-existing grants for garb on condition that he never again wore a Greek cloak."
The sources on this topic - how the Persians rewarded their one-time enemy Themistocles of Athens once he had fled Greece and taken refuge with them in the 460s BCE - fall into two groups. Thucydides 1.138 (followed by Diodorus, Nepos, Strabo and others) has only Lampsacus, Magnesia and Myus; Plutarch, Themistocles 29 (citing two earlier authorities), adds Percote and Palaescepsis. But only the unnamed source of Athenaeus adds Gambreion (a city in the valley of the R. Kaikos, E of Pergamum). This is almost certainly a mistake, since Xenophon (Hellenica 3.1.6) explicitly mentions Gambreion in a list of cities of the region already allocated to another benefactor of Persia, Gongylos of Eretria. See A.J. Podlecki, The Life of Themistocles (Montreal 1975) 129 with n.134.