While I'm at it, let me also plug Kh. Krista West's fine book The Garments of Salvation. Here's a synopsis:
It can be purchased here. And now to the article itself...
(The Met) - Why Vestments? An Introduction to Liturgical Textiles of the Post-Byzantine World
The exhibition Liturgical Textiles of the Post-Byzantine World, now on view through November 1, 2015, presents a selection of notable liturgical vestments that communicate the continuing prestige of the Orthodox Church and its clergy in the centuries following the fifteenth-century fall of Byzantine Constantinople to the Ottoman Turks. From a strictly theological viewpoint, vestments are hardly a necessity for Christian worship. Liturgical scholars are largely in agreement that for the first several centuries of Christianity's existence, its clergy officiated at services wearing the normal "street dress" of the Roman world. Only gradually did these items of clothing take on special significance as liturgical vestments, to be worn only during worship.
The tunic—worn by virtually everyone in Late Antiquity, regardless of age, rank, or gender—was stylized to become the sticharion, or alb; while the outer, poncho-like cloak, the Roman paenula, became the vestment known in the West as the chasuble (from casula, "little house") and in the Greek-speaking East as the phelonion. By the fourth century, special stoles of office were added for the deacon and for the bishop (the orarion and omophorion, respectively), while the priest's stole, the epitrachelion, also worn by bishops, appears in textual records only several centuries later.
The history of liturgical vestments in the later centuries of the Byzantine Empire is one of increasing distinctions. Not only did vestments, as before, differentiate the clergy from the laity and distinguish orders within the clergy (bishops, priests, deacons, subdeacons, etc.), but new additions to the repertoire of vestments helped to distinguish rank within these clerical orders. Hence, from the eleventh century onward, metropolitans and other bishops of high rank were entitled to wear the polystavrion phelonion, a vestment decorated with an all-over pattern of crosses. Byzantine canonists' repeated insistence on the limited number of bishops entitled to this vestment is belied by its rapid spread over the twelfth through fourteenth centuries. Perhaps to compensate, a still more privileged vestment, the sakkos, was introduced in the twelfth century, to be worn only by patriarchs and archbishops on only the most important of feast days.
The introduction of figural embroidery on vestments, which likely occurred in Byzantium as a new phenomenon in the twelfth century, can be seen as part of this trend to differentiate the garments and insignia of the highest-ranking figures from those of lower ranks. This is not to say, of course, that the embroideries were merely a means of self-aggrandizement by the clergy; rather, they point beyond themselves to the mysteries of the liturgy as a dramatic reenactment of the life of Christ and a microcosm of the divine kingdom.
The Benaki Museum, in Athens, houses an impressive post-Byzantine icon from Corfu (left) depicting Saint James of Jerusalem. James the Adelphotheos ("Brother of God," that is, of Jesus) was considered the first bishop of Jerusalem, and the icon shows the saint clothed in the vestments that might have been available to a well-positioned bishop in the seventeenth century. His omophorion and the lining of his phelonion imitate Italian damasks, while the outer fabric of his phelonion recalls the repeating patterns of crosses typical of Ottoman silks woven for use in the Christian liturgy (as seen in the hanging above). His epitrachelion and epigonation, moreover, are depicted as bearing elaborate embroidery in silk and gold. The subjects depicted—priests, kings, and prophets of the Old Testament on his epitrachelion, and the entombment of Christ on his epigonation—emphasize his connection to Jerusalem, the site of Christ's death, burial, and resurrection, and his role as a high-priestly successor to his forebears who served in the Jewish Temple.
Although vestments of the late Byzantine period (1261–1453) were generally decorated with embroidery on plain, unpatterned silk textiles, the post-Byzantine period saw the rise of patterned silks intended specifically for liturgical use. These seem to have been a specialty of the imperial Ottoman textile workshops at Bursa and Istanbul, and records from Moscow attest to the importation of various patterns of woven silks—many with gold and silver threads—from Ottoman Turkey to Muscovy for use in the vestments of the clergy.
One such pattern, with the figure of Christ enthroned among the four symbols of the Evangelists, is known from vestments in the Kremlin in Moscow and can be viewed on a sakkos now in the collection of the Rhode Island School of Design (RISD) Museum. Like the two Ottoman textiles featured in the exhibition (below, top left and top right), its figural motifs are surrounded by crosses with the abbreviations ΙϹ ΧϹ ΝΙΚΑ, for "Jesus Christ is victorious." These patterns thus continue to adhere, centuries later, to the custom that the vestments of the clergy of highest rank should be adorned with repeating patterns of crosses. Even the Russian embroidered yoke of a phelonion, the design of which borrows from the stock of ornamental motifs—vines, tulips, serrated saz leaves—common among Ottoman textiles, also includes golden crosses at the centers of the silver, palmette-shaped leaves.