Forgive me, I got confused here, despite having not seen a Syriac or Armenian deacon ... for a while, while having very recently attended an EO service with a deacon. So what I said applies only to the Armenian and Syriac churches.
Since the subject of Oriental Orthodox vestments is interesting and I am a vestment nerd, I will share some photos and provide a detailed explanation. Except for how the deacons keep their stoles on; that remains a mystery!
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Here is an Armenian deacon, to the right of the two priests, who is wearing a dark red stole, descending vertically unlike an EO deacon. My understanding, which
@Pavel Mosko might confirm for us, is that lower ranking Armenian clergy simply wear the dalmatic or tunicle sort of vestment we can see on the altar servers and the deaconess. Notice also the priestly vestments closely resemble Eastern Orthodox vestments. I have heard that the designation “stole bearer” along with this same stole, worn on the other side, is granted to some long serving altar servers who are not trained for the special ministry of the typical diaconate (they basically function as male choristers, like the “gentleman clerks” of some Anglican churches like the Chapel Royal and Westminster Abbey, as distinct from the choir of boys, which function as boarding schools; compare the Latin equivalents for choir and clerks or Psaltis those being Scholae and Cantores)
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Here is a Syriac Orthodox full deacon, Deacon Shamosho, from a Levantine/Iraqi/Aramaean (Suroyo) parish in the North Eastern US. Notice how his dalmatic goes over one shoulder only.
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For comparison, here is a Syriac Orthodox subdeacon from the same parish, Deacon John, alomg with Reader Gregorios. Psaltis, who are usually boys, wear just the white alb. Syriac Deacons do not wear Dalmatics.
Syriac deacons are not referred to as “Father Deacon” and have more restricted duties than EO deacons or Armenian deacons, and often in Suroye parishes promotion from Psalti to Reader, Subdeacon and Deacon is partially based on seniority, also partially based on singing ability (a
major requirement for Coptic and Syriac priests, who chant more than any clergy in other churches, as
@dzheremi can attest); I believe they can also marry in at least the Malankara Orthodox Syrian Church, whereas in that same church, and the other two Syriac Orthodox jurisdictions (there is a silly three way schism among the Nasrani Syriac Orthodox of the Malabar Coast in India, due to a leadership dispute): the Malankara Independent Syrian Church, which is the one in communion with the Anglican Mar Thoma Syrian Church
@Paidiske, and in the Syriac Orthodox Patriarchate of Antioch, only monks or married men are ordained to the priesthood.
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In contrast, the Eucharistic vestments of a Syriac Orthodox priest and those of a bishop (which are basically the same) look like those of Eastern Orthodox clergy.
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This picture, showing a bishop (center) flanked by two priests, shows there are no liturgical colors, except black choir dress is worn in Holy Week. Thus two priests or one priest and a bishop often wear different colored vestments, which has a beautiful visual effect. Sometimes an assisting priest will also wear black choir dress, which you can see on the priest on the left. I have also seen priests dispense communion after the dismissal, during and after the singing of the beautiful hymn “Haw Nurone”, having already changed back into choir dress. They will remove the simple Byzantine epitrachelion-like stole when not officiating in any capacity. These stoles, both the choir dress form and the more ornate Eucharistic variety, are called “Hamnikho” in Syriac, meaning necklace. A complete guide to Syriac Eucharistic vestments can be found here, demonstrated by His Eminence Archbishop Eugene Kaplan of the Western US:
Vestments Noteworthy are the ornate liturgical slippers worn by priests and bishops. Priests also wear their
Phiro at all times, and bishops, their
eskimo.
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The only Oriental Orthodox church with liturgical colors is the Coptic church, where Readers wear black or blue stoles during Holy Week and red stoles on other occasions. Coptic psalti and reader’s stoles are usually reversible, red on one side, and dark blue on the other, and tend to be very long due to the elaborate patterns they are placed in. In contrast tne stoles and epitrachelia of deacons, priests and bishops (a bishop is in the center of the photograph above), are obviously not reversible and are of a finer quality, as are their albs, which are worn over cassocks rather than street clothes.
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In the previous photo (with the red stoles usually worn), you can also see the rare Coptic full deacon, who wears a white skullcap at all times, and a stole in the Byzantine manner.
The second photo depicts clergy of St. George’s Mission in the UK, formerly a part of the British Orthodox Church before Metropolitan Seraphim of Glastonbury made a personal decision to become an episcopi vagante with no parishioners. That is a nasty story; I am friends with a St. George’s, ex-BOC priest, Fr. Peter Farrington, and the actions of Metropolitan Seraphim did a lot of damage and caused many BOC members to leave. But enough with sordid ecclesiastical politics, back to the vestments!
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Coptic priests in theory should wear a cope/phelonion/chasuble but in practice this is rare (the older priest in white not wearing one is a hieromonk, or monastic priest; also I have heard the current style of mitre was introduced under Pope Shenouda, RIP. Bishops
usually do wear a cope, however (on the right).
Ethiopian vestments are complex and warrant their own post, by someone who knows more about some of tne specific types of vestments (they might also use liturgical colors, I just don’t know; Ethiopian Christianity is obscure (the whole liturgy of the Coptic church is available on an app called CopticReader, in English, Coptic and Arabic, while there are many Ethiopian liturgical manuscripts sitting in monasteries that are barely known to the outside world, let alone translated into English).