The rather detailed description of John's clothing appears to provide a twin function:
1. Contrast with the finery of the wealthy
We have several gospel accounts of Jesus Eulogizing John and his prophetic office in Matt 11:7-14 -
As John’s disciples were leaving, Jesus began to speak to the crowds
about John: “What did you go out into the wilderness to see? A reed
swaying in the wind? Otherwise, what did you go out to see? A man
dressed in fine clothes? Look, those who wear fine clothing are found
in kings’ palaces. What then did you go out to see? A prophet? Yes, I
tell you, and more than a prophet. This is the one about whom it is
written:
‘Behold, I will send My messenger ahead of You, who will prepare Your
way before You.'
Truly I tell you, among those born of women there has risen no one
greater than John the Baptist. Yet even the least in the kingdom of
heaven is greater than he. From the days of John the Baptist until
now, the kingdom of heaven has been subject to violence,f and the
violent lay claim to it. For all the Prophets and the Law prophesied
until John. And if you are willing to accept it, he is the Elijah who
was to come
We have a similar record in Luke 7:24-28. Both quote Mal 4:5 about the coming "Elijah"
2. John's connection with the actual historical Elijah
- 2 Kings 1:8, They replied, "He had a garment of hair and had a leather belt around his waist." The king said, "That was Elijah the Tishbite."
- Zech 13:4, “On that day every prophet will be ashamed of his vision when he prophesies. He will not put on a hairy cloak in order to deceive,
Most commentators have noticed the same thing. Ellicott says:
(4) His raiment of camel’s hair.—The dress was probably deliberately
adopted by the Baptist as reviving the outward appearance of Elijah,
who was “a hairy man, and girt with a girdle of leather” (2Kings 1:8);
and the “rough garment,” that had been characteristic of the prophet’s
life even at a later period (Zechariah 13:4), as contrasted with the
“long garments” of the Pharisees (Mark 12:38), and the “gorgeous
apparel” of the scribes who attached themselves to the court of Herod
(Luke 7:25). The Nazarite vow of Luke 1:15 probably involved long and
shaggy hair as well.
Benson also agrees -
Matthew 3:4. And the same John — The following description of John is
added, that it might appear he did not live in obscurity, but was
sufficiently known to all: had his raiment of camel’s hair — Not, as
some have supposed, a camel’s skin, raw and undressed, but a kind of
sackcloth, coarse and rough, made of the raw long hair of camels, and
not of their fine and soft hair, dressed and spun into thread. The
difference between these two is as great as that between flax rude or
unprepared, and the same dressed or spun; or between that which we now
call hair cloth, made of undressed hair, and camlet, that is made of
it when it is softened, and spun, and prepared; in imitation of which,
though made of wool, is the English camlet. Elijah seems to have wore
a similar garment, and therefore was called a hairy man; which
expression is supposed to refer to his clothing rather than his body.
Most of the ancient prophets wore such garments, whence we read of the
false prophets putting on a rough garment to deceive, Zechariah 13:4;
and of the witnesses prophesying in sackcloth, Revelation 6:12; and
Revelation 11:3. And a leathern girdle about his loins — In this
respect, also, being like Elijah, in whose spirit and power he came,
Malachi 4:5; Luke 1:17.