We praise God through the five senses. Catholic Churches have always been a feast for the eyes, from the beauty of their architecture to their statuary, paintings, icons, mosaics, frescoes, and stained glass windows.
Another example of beauty would be in vestments. Vestments are the liturgical garb that deacons, priests, and bishops wear for Mass or other celebrations. Four principal colors are used in the liturgical vestments which coincide with the seasons in the Church calendar.
First is white, though gold may be used in substitution. White indicates jubilation as well as purity. Some of the feasts that use white are Christmas and Easter. White is used on Christmas because it is the birth of Jesus and the dawn of salvation.
On Easter, the white represents the purity and innocence that our Risen Lord gives to our souls through the Sacraments. White is used for any commemoration of feasts of Jesus, Mary, and the Saints who are not martyrs. It is used in celebration of the Sacraments of Baptism, First Holy Communion, Holy Matrimony, and Holy Orders. White is employed in any celebrations involving the Holy Eucharist, such as benediction. In celebration of the Mass of Christian burial, white is worn along with the colors of black and purple. When using white for funerals, you are reminding the faithful of the resurrection of Jesus and our future resurrection.
The second color that is used in the liturgy is green. Green represents ordinary time, which is the liturgical season outside of Advent-Christmas and Lent-Easter. The majority of the year is ordinary, even though saints and martyrs celebrations dot the calendar. Green is the color of life. Christ gives life through the celebration of the Sacrifice of the Mass all year long.
Red is the third color and it is used for the Feast of the Holy Spirit and the Sacrament of Confirmation. Red symbolizes fire; biblically, the Holy Spirit is portrayed as tongues of fire. It is also used for the Passion of Our Lord on Palm Sunday and Good Friday when Christ, the martyr par excellence, shed His blood for the world. Finally, red is used for the commemoration of martyrs. Martyrs shed their blood for Christ; therefore red is a symbol of blood.
Purple is the final color. It is used to convey the meaning of penance and preparation. Advent and Lent are the two seasons during which purple is employed. The priest also wears purple for the Sacraments of Penance and Anointing of the Sick.