Amice : Symbol of the helmet of salvation
The amice is a rectangular piece of white linen with two strings at the upper corners which a cleric uses underneath his alb to cover the neck so that the Roman collar of the cassock is hidden. The word amice comes from the Latin amicire, meaning “to cover” and, because the heads of criminals condemned to death were covered in linen, the amice recalls the humiliation which was put upon Christ. As he puts on the amice, the priest kisses the Cross on the Amice and prays:
Place upon me, O Lord, the helmet of salvation, that I may overcome the assaults of the devil.
Alb : Symbol of purity
The alb is the long white, robe-like vestment worn by all clerics at liturgical celebrations (celebrant, concelebrant, deacon, or acolyte). The alb (from Latin wordalba, meaning “white”) can be traced to the ancient Roman alb worn under a cloak or tunic; its color symbolizes purity and its form recalls that described in Ezekiel 28:4. As he puts on his alb, he prays:
Purify me, O Lord, and cleanse my heart; that, being made white in the Blood of the Lamb, I may come to eternal joy.
Cincture : Symbol of Chastity
Stole : Symbol of the clerical office, immortality, and the yoke of Christ
The stole, matching the liturgical color, is a long, scarf-like vestment worn over the alb and under the dalmatic/chasuble. The priest wears the stole around his neck so that it hangs equally down his chest in front or forms an X-shaped Cross; the deacon wears his stole over the left shoulder and tied at his right side; the Bishop wears his stole so that it hangs equally down his chest. As he puts on the stole, the priest kisses the Cross on the stole and prays:
Restore unto me, O Lord, the stole of immortality, which was lost through the guilt of our first parents: and, although I am unworthy to approach Your sacred Mysteries, nevertheless grant unto me eternal joy.
Chasuble or Cope: For the Eucharistic Liturgy
The chasuble, also matching the liturgical color, is is the long, often ornate, sleeveless poncho-like garment worn by priests and bishops over the alb and stole during the sacrifice of the Mass. As he puts on the chasuble, he prays:
O Lord, Who said: My yoke is easy and My burden light: grant that I may bear it well and follow after You with thanksgiving. Amen.
From: Altar Servers at Francis of Assisi