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White vestments are worn
White or gold are the colors of the day.
papal serape
It is an outer vestment worn by a priest.
If an altar server is wearing a black or red vestment that is full length that is called a cassock. A short white vestment worn over the black or red long vestment is called a surplice. A white vestment if full length is called an alb .
Pallium
Green would be worn on her feast day as it occurs during Ordinary Time.
White or blue vestments may be worn on this Feast Day. The color blue is permitted only on Feast Days dedicated to the Blessed Virgin as it was her favorite color.
.Catholic AnswerThe priest wears a white chasuble (gold may be worn) and stole on Easter, and throughout the Easter Season, including Divine Mercy, and Ascension.
A chasuble is a vestment worn by priests when they are saying mass. It is sleeveless, and is worn as an outer vestment. It is often quite decorated, and has the colors of the liturgical season. There is a link below to an article on the chasuble.
The white vestment worn by the priest is called an alb ( from the latin "albus", meaning "white"). It also worn by deacons, servers, and occasionally Eucharistic ministers. A white vestment placed over the alb at Mass is called a chasuble for priests and dalmatic for daecons. That can be red, green, violet, or white. White is worn during certain liturgical seasons and holy days, but the alb is always white, sometimes "off" white or ivory.
The most common color worn by priests is green, which is the color for Ordinary Time. White (or gold) is worn for the Seasons of Christmas and Easter. It is also worn on feasts of Our Blessed Lord (saving His Passion), Feasts of the Blessed Mother, and Feasts of the Saints who were not martyrs. Violet is worn during Advent and Lent, it is also worn when hearing confessions, and sometimes during funerals. Red is worn during Feasts of Martyrs, Feasts of the Holy Spirit, and on Good Friday.