The interpretation timeline
Revelation 1:13 Douay-Rheims

And in the midst of the seven golden candlesticks, one like to the Son of man, clothed with a garment down to the feet, and girt about the paps with a golden girdle.

A.D. 220 – 1871 7 witnesses 8 excerpts

Patristic

before A.D. 750
220
A.D.
Tertullian Patristic
c. A.D. 150–220
“And, behold, six men were coming toward the way of the high gate which was looking toward the north, and each one's double-axe of dispersion was in his hand: and one man in the midst of them, clothed with a garment reaching to the feet, and a girdle of sapphire about his loins: and they entered, and took their stand close to the brazen altar. But the "Jesus" there alluded to is Christ, the Priest of God the most high Father; who at His First Advent came in humility, in human form, and passible, even up to the period of His passion; being Himself likewise made, through all (stages of suffering) a victim for us all; who after His resurrection was"clad with a garment down to the foot," and named the Priest of God the Father unto eternity.”
Source
303
A.D.
c. A.D. 250–303
“"The court which is within the temple leave out." The space which is called the court is the empty altar within the walls: these being such as were not necessary, he commanded to be ejected from the Church. "It is given to be trodden down by the Gentiles." That is, to the men of this world, that it may be trodden under foot by the nations, or with the nations. Then he repeats about the destruction and slaughter of the last time, and says:- "They shall tread the holy city down for forty and two months; and I will give to my two witnesses, and they shall predict a thousand two hundred and threescore days clothed in sackcloth." That is, three years and six months: these make forty-two months. Therefore their preaching is three years and six months, and the kingdom of Antichrist as much again.”
Source
“"As it were the Son of man walking in the midst of the golden candlesticks." He says, in the midst of the churches, as it is said in Solomon, "I will walk in the midst of the paths of the just," whose antiquity is immortality, and the fountain of majesty. "Clothed with a garment down to the ankles." In the long, that is, the priestly garment, these words very plainly deliver the flesh which was not corrupted in death, and has the priesthood through suffering. "And He was girt about the paps with a golden girdle." His paps are the two testaments, and the golden girdle is the choir of saints, as gold tried in the fire. Otherwise the golden girdle bound around His breast indicates the enlightened conscience, and the pure and spiritual apprehension that is given to the churches.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And in the midst of the seven candlesticks one like unto the son of man,.... By whom is meant not an angel, for he speaks of himself as a divine Person, as the Alpha and Omega, the first and the last, phrases not applicable to any created beings; and of himself also as having been dead, which angels are not capable of, and of living again, and of living for evermore, and having power over death and the grave, which no creature has; yea, he calls himself expressly the Son of God, Rev 1:11; so that Christ is manifestly designed, who, as a divine Person, appeared in a form like that individual human nature which was at his Father's right hand; for that human nature of his, or he as the son of man, was not in the midst of these candlesticks, or churches, but he the Son of God was in a form like to his human nature in heaven; so before his incarnation, he is said to be like unto the son of man, in Dan 7:13; to which there is a reference here, and not only in this, but in some other parts of the description; so after his ascension, he in a visionary way appears, not in that real human nature he assumed, but in a form like unto it, that being in heaven; but when he was here on earth he is called the son of man, and not like to one; though even such a phrase may express the truth and reality of his humanity, for who more like to the son of man than he who is so? see Joh 1:14; now Christ was seen by John in the midst of the candlesticks or churches, and among whom he walked, as in Rev 2:1; which is expressive of his presence in his churches, and which he has promised unto the end of the world; and of the gracious visits he makes them, and the sweet communion and conversation he indulges them with, to their joy and comfort; as well as the walks he takes among them for his own delight and pleasure; and where he is, abides and takes his turns, particularly as a priest, in which form he now appeared, as the antitype of Aaron the high priest, to him the lamps or candles in the candlesticks, to cause them to burn more brightly and clearly: clothed with a garment down to the foot; which some understand of the righteousness of Christ; this is called a garment, a wedding garment, the best or first robe, the robe of righteousness; and is fitly compared to one, it being unto, and upon believers, put upon them, and which covers their persons, keeps them warm and comfortable, and beautifies and adorns them; and is a very beautiful, pure, and spotless robe; and reaches to the feet, covers all the members of Christ's mystical body, the meanest and lowest, as well as the more excellent; the weakest believer as well, and as much, as the strongest: but not Christ mystical, but personal, is here represented; others therefore think that this long garment is a sign of gravity and wisdom, it being usual for men of power and authority, and learning, as the Jewish sanhedrim, Scribes and Pharisees, to wear long garments; but it seems rather to design a priestly robe; the robe of the ephod wore by the high priest is called by this name in the Septuagint version of Exo 28:4; and so it is by Josephus (i), who speaking of the hyacinthine tunic, or robe of blue, says, this is "a garment down to the foot", which in our language is called "Meeir"; rather it should be "Meil", which is its Hebrew name; and so this robe is expressed by the same word here, used by Philo the Jew (k), and by Jerom (l); so Maimonides (m) says, the length of his garment was to the top of his heel: and in the habit of a priest did Christ now appear; and so he is described in his priestly office, in the midst of his churches, having made atonement for their sins by the sacrifice of himself; and now as their high priest had entered into the holiest of all with his own blood and righteousness; bore their names on his breastplate, appeared in the presence of God on their account, and ever lived to make intercession for them: and girt about the paps with a golden girdle; as the high priest was with the girdle of the ephod, which was made of gold, of blue, purple, scarlet, and fine twined linen, Exo 28:8; and with which the priests were girt about the paps, or breast, as Christ is here described: it is said of the priests in Eze 44:18, "they shall not gird themselves with anything that causeth sweat"; which some render "in sweating places": and so some Jewish writers interpret it, which will serve to illustrate the present place, "says R. Abai (n), (upon citing Eze 44:18) they do not gird themselves in the place in which they sweat; according to the tradition, when they gird themselves they do not gird neither below their loins, nor above their arm holes, but over against their arm holes; the gloss says, upon their ribs, against their arm pit, that is, about their breast, or paps; and which is still more plainly expressed by the Targum on the above place, which paraphrases it thus, "they shall not gird about their loins, but they shall gird , "about their heart". So Josephus (o) says, the high priest's garment was girt about the breast, a little below the arm holes. Christ's girdle, as a King, is the girdle of faithfulness and righteousness, which is about his loins; and his girdle, as a prophet, is the girdle of truth; but, as a priest, it is the girdle of love; it is that which has constrained him to put himself in the room and stead of his people, to assume their nature, give himself a sacrifice for them, and intercede on their behalf: this is like a girdle, round from everlasting to everlasting; is said to be "golden", because of the excellency, purity, glory, and duration of it; and because it is very strong, affectionate, and hearty, it is hid to be a girdle about the paps, near where is the heart, the seat of love; and this may also denote the power, strength, and readiness of Christ to assist and help his churches in every time of need, (i) Antiqu. l. 3. c. 7. sect. 4. (k) De Vita Mosis, l. 3. p. 671. (l) Ad Fabiolam. fol. 19. H. (m) Cele Hamikash, c. 8. sect. 17. (n) T. Bab. Zebachim, fol. 18. 2. & 19. 1. Yalkut Simeoni, par. 2. fol. 74. 2. Vid. Jarchi & Kimchi in Ezek. xliv. 18. (o) Antiqu. l. 3. c. 7. sect. 2.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“Like unto the Son of man - This seems a reference to Dan 7:13. This was our blessed Lord himself, Rev 1:18. Clothed with a garment down to the foot - This is a description of the high priest, in his sacerdotal robes. See these described at large in the notes on Exo 28:4, etc., Jesus is our high priest, even in heaven. He is still discharging the sacerdotal functions before the throne of God. Golden girdle - The emblem both of regal and sacerdotal dignity.”
Source
1849
A.D.
1774–1849
“And in the midst of the seven golden candlesticks, i.e. walking among the candlesticks, like unto Christ, as he many times called himself the Son of man, and at other times told the Jews he was the Son, the only begotten Son of God. By this walking among the candlesticks is signified his providential care over all the particular Churches, which make up one Catholic Church. — With a long garment, [4] and a golden girdle, with a resemblance of the habit of the priests. (Witham) — Jesus Christ is in the midst of his Church to enlighten it, to defend and sanctify it, the true model of pastors, who should reside in the midst of their flock, be clothed with sanctity and justice, and girt with the golden girdle, i.e. with singular purity, always ready for combat and labour, by their charity and zeal.”
Source
1871
A.D.
1871
“His glorified form as man could be recognized by John, who had seen it at the Transfiguration. in the midst--implying Christ's continual presence and ceaseless activity in the midst of His people on earth. In Rev 4:1-3, when He appears in heaven, His insignia undergo a corresponding change yet even there the rainbow reminds us of His everlasting covenant with them. seven--omitted in two of the oldest manuscripts, but supported by one. Son of man--The form which John had seen enduring the agony of Gethsemane, and the shame and anguish of Calvary, he now sees glorified. His glory (as Son of man, not merely Son of God) is the result of His humiliation as Son of man. down to the foot--a mark of high rank. The garment and girdle seem to be emblems of His priesthood. Compare Exo 28:2, Exo 28:4, Exo 28:31; Septuagint. Aaron's robe and girdle were "for glory and beauty," and combined the insignia of royalty and priesthood, the characteristics of Christ's antitypical priesthood "after the order of Melchisedec." His being in the midst of the candlesticks (only seen in the temple), shows that it is as a king-priest He is so attired. This priesthood He has exercised ever since His ascension; and, therefore He here wears its emblems. As Aaron wore these insignia when He came forth from the sanctuary to bless the people (Lev 16:4, Lev 16:23-24, the chetoneth, or holy linen coat), so when Christ shall come again, He shall appear in the similar attire of "beauty and glory" (Isa 4:2, Margin). The angels are attired somewhat like their Lord (Rev 15:6). The ordinary girding for one actively engaged, was at the loins; but JOSEPHUS [Antiquities,3.7.2], expressly tells us that the Levitical priests were girt higher up, about the breasts or paps, appropriate to calm, majestic movement. The girdle bracing the frame together, symbolizes collected powers. Righteousness and faithfulness are Christ's girdle. The high priest's girdle was only interwoven with gold, but Christ's is all of gold; the antitype exceeds the type.”
Source

Undated

date unknown
date
unknown
Glossa Ordinaria Medieval
“Like to the Son of man. That is, an angel in the person of Christ, who is now not called the Son of man, but like to him, because he now dies no more. Or, like to the Son of man, because Christ appeared not with sin, but in the likeness of sinful flesh, in whom are all things necessary for the government of the Church. With a long robe. That is, with a priestly vestment, that is, the flesh in which he offered himself, and daily offers, presenting himself to God the Father. Or, the long robe is the Church, with which God is clothed as with a tunic, which is called reaching to the ankles, because the Church is to endure until the end of the world. Girt about at the paps. Daniel saw him girt as to the loins in the Old Testament, because there carnal things are bound fast; here we read of him girt about at the paps, because in the New Testament even thoughts are judged.”
Source
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.