Sticharion

The sticharion (also "stikharion" or "stichar"; Greek: στιχάριον; Slavonic: стихарь) is a liturgical vestment of the Eastern Orthodox and Eastern Catholic Churches, roughly analogous in function to the alb of the Western Church. The sticharion is worn by all classes of ordained ministers in the Constantinopolitan Rite and comes in two forms: one worn by priests and one worn by deacon and other altar servers.
The sticharion is derived from the "chiton", a long, sleeved garment which reached to the ground and was worn in ancient times by both men and women.
Deacons and Servers.
In the form worn by deacons, subdeacons, altar servers, and sometimes by readers, the sticharion is a long robe with wide, loose sleeves, fastened at the neck, and often open down the sides but held shut with buttons or ties. Thus in form, it is close to the dalmatic and tunicle of Western Christianity. There is usually a cross embroidered or appliquéd to the center of the back, between the shoulder blades. This type of sticharion is often made from rich brocade in the various liturgical colors, and worn as an outer vestment. The sticharion is symbolic of "a pure and tranquil conscience, a spotless life, and the spiritual joy in the Lord which flows therefrom."
Priests.
The sticharion used by priests and bishops is worn as the undermost vestment. In this form, it is often made from a lighter fabric: linen, satin, silk, etc., and is usually white in color, though it may also be made of colored fabric. It is usually far less ornate than the deacon's sticharion. The priest's sticharion has narrow sleeves that tie at the wrists. The white color symbolizes that the grace of the Holy Spirit covers the celebrant with a garment of salvation.
In the Russian tradition, a bishop's stikharion can be more elaborately embellished than a priest's and is sometimes called a "podsakkosnik" (Russian:подсаккосник), "i.e.", "under-sakkos".
Coptic priests usually wear a plain, white sticharion, often without an over vestment. Chaldean and Assyrian priests where a similar alb-like garment, called a "kottinâ". The Syriac "kuttino" is now almost always white also. The Armenian "patmucan" and Ethiopian "qamis" are similar to the sticharion.
Liturgical use.
Deacons, subdeacons and altar servers wear the sticharion at any service at which they are serving. However, in Greek practice, the custom has developed to wear only the orarion and epimanikia without the sticharion during the lesser services.
Before vesting, the deacon or altar servicemen will take his sticharion for the priest (or bishop, if he is present) to bless before he puts it on. Bishops and priests will bless their vestments themselves before vesting. Each minister will kiss the cross on the back of their phelonion before putting it on.
When vesting for the Divine Liturgy priests and deacons say the following vesting prayer as they put on the garments:
When a bishop is vesting before the Divine Liturgy the prayer above is read by the Protodeacon, as the subdeacons place the vestment upon him. Sometimes this prayer is chanted by the choir during the vesting of the bishop.