So I bought a belt according to the word of the LORD, and put it on my waist.
Read Chapter 13
Clement Of Alexandria
AD 215
The blessed John disdained sheep’s wool because it savored of luxury; he preferred camel’s hair and clothed himself in it, giving us an example of simple, frugal living. Incidentally, he also ate only honey and locusts, food that is sweet and with a spiritual significance. So it was that he prepared the way of the Lord and kept it humble and chaste. He fled from the false pretenses of the city and led a peaceful life in the desert with God, away from all vanity, boasting and servitude. How could he possibly have worn a purple mantle? Elijah used a sheepskin for his garment and girded it tight with a belt made of leather. Isaiah, another historic prophet, went “naked and without sandals” and often put on sackcloth as a garment of humility. If you protest and make mention of Jeremiah, he wore only a loincloth made of linen. - "Christ the Educator 10.112–13"
Furthermore, this Paul said strongly that “the kingdom of God is not a matter of eating and drinking”—or abstinence from wine or meat—“but of righteousness, peace and joy in the Holy Spirit.” Which of them goes around like Elijah wearing a sheepskin and a leather belt? Which of them wears no shoes and nothing but a piece of sackcloth like Isaiah? Or with nothing on but a linen loincloth, like Jeremiah? - "Stromateis 3.6.53.4–5"