John Chrysostom
He now also says, "The man whose belt this is, they will bind in this way." The prophets depicted the future by visible signs when they foretold captivity. Ezekiel, for example, did this, and Agabus did the same. What is grievous is that "they will deliver him into the hands of the Gentiles." See, Agabus did not say that they would bind Paul, lest it seem that he spoke by agreement with his enemies. Instead he said, "the man whose belt this is." Therefore Paul had a belt. Such was the custom of the ancients, before soft and billowing clothing came into use. Peter was girded in this way (cf. John 21:7), and so was Paul: "The man whose belt this is," it says (Acts 21:11). Elijah was clothed in the same way (4 Kgs 1:8). So too was each of the saints, because they were continually active.
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Either they were traveling, or they were engaged in some other necessary work and labor. Yet they dressed this way not only for this reason, but also because they despised every ornament and loved a strict and austere life. Christ Himself sets this forth as the greatest praise of virtue: "What then did you go out to see? A man clothed in soft garments? Those who wear soft garments are in kings’ houses" (Matt 11:8).