A priest friend sent this:
Dom Gueranger has some fascinating points for today’s feast. He states that the vestments for today’s feast is Purple: “The Red vestments of a Martyr’s Day would be too expressive of that stream of infant blood which forbids the Mothers to be comforted, and joyous White would ill suit their poignant grief; she therefore vests in Purple, the symbol of mournfulness…In this, as in everything she does, the Church acts with an exquisite delicacy of feeling. Her Liturgy is a school of refined Christian considerateness.” Unfortunately this is no longer followed in either form, and the color is Red.
Also, according to Gueranger, the Gloria and Alleluia were also not sung today. Finally, the practice was sanctioned in Cathedrals and Collegiate Churches to allow young boys to sing with the choir today, in honor of the Holy Innocents. These are great Traditions and it is too bad they are lost.