Most complicated.
Vestments Tools of the Liturgical Trade! [Ecumenical]
The story behind the white and yellow colors of the Vatican flag
The Sacrifice of the Mass: Liturgical Vestments
Of Miters and Men (brief look at symbolism of bishop's vestments) [Ecumenical]
Purification of Sacred Vessels in U.S. (and more on the Purification of our Lord)
Being Catholic: Sacred Things, [Holy] Water
Being Catholic: Sacred Things, [New] Fire, Paschal Candle
Being Catholic: Sacred Things, Holy Oils
Being Catholic: Sacred Things, Crucifixes and Crosses
Being Catholic: Sacred Things, Sacred Images: Statues and Other Icons
Being Catholic: Sacred Things, Incense
Being Catholic: Sacred Things, Palm Branches
Being Catholic: Sacred Things, Ashes
Being Catholic: Sacred Things, Relics and the Incorruptibles
I would daresay that very few Catholics even know the names of the vestments that a priest wears, let along the significance of each, or that he says a prayer while putting it on.