Many people are not familiar with the spectrum of scapulars approved by the Church. Indeed, it seems like the array of scapulars reflects the array of apparitions and titles of Mary. Most Catholic sources present the following summary.
The brown scapular of Our Lady of Mount Carmel: This scapular is the best-known and most popular of the different scapulars. According to tradition, our Blessed Mother appeared to St. Simon Stock at Cambridge, England on Sunday, July 16, 1251. (In our liturgical year, July 16 is the feast day for Our Lady of Mount Carmel.) She presented him with the scapular and said, ‘Take, beloved son, this scapular of thy order as a badge of my confraternity and for thee and all Carmelites a special sign of grace; whoever dies in this garment, will not suffer everlasting fire. It is the sign of salvation, a safeguard in dangers, a pledge of peace and of the covenant.”
In this apparition and gift, our Blessed Mother promised a special protection for all members of the Carmelite Order, and a special grace at the hour of death to all who wear the scapular so that they would not perish in Hell but would be taken up to Heaven by her on the first Saturday after their death. (Note that the Church does not teach that wearing a scapular is some sure ticket to Heaven; rather, we must strive to be in a state of grace, implore our Lord’s forgiveness, and trust in the maternal aid of our Blessed Mother — all positive acts of a person who wears a scapular sincerely.)
The red scapular of Christ’s Passion: In 1846, Christ appeared to a Daughter of Charity of St. Vincent de Paul and presented a red scapular. One side depicts our crucified Lord with the implements of the passion at the foot of the cross; around the image is the inscription, “Holy Passion of Our Lord Jesus Christ, save us.” On the other side, the Hearts of Jesus and Mary are depicted, with the surrounding inscription, “Sacred Hearts of Jesus and Mary, protect us.” Christ promised that all who wear this scapular on every Friday would have a great increase of faith, hope and charity. This apparition was repeated several times, and On June 25, 1847, Pope Pius IX formally approved the scapular and granted permission for its blessing and investiture.
The black scapular of the Seven Sorrows of Mary: After Pope Alexander IV’s formal establishment of the Servite Order in 1255, lay men and women formed a confraternity in honor of the seven sorrows of Mary. As a sign of membership, they wore a black scapular, usually with an image of our Mother of Sorrows on the front.
The blue scapular of the Immaculate Conception: In 1581, Venerable Ursula Benicasa, foundress of the Order of Theatine Nuns, had a vision of our Lord who revealed to her the habit and scapular her community was to wear in honor of the Immaculate Conception. Venerable Ursula implored our Lord to grant the same graces to the faithful who would wear a small, light blue scapular, bearing on one side the image of the Immaculate Conception and on the other the name “Mary.” In 1671, Pope Clement X granted permission to bless and invest people with this scapular. Later in 1894, a Confraternity of the Immaculate Conception of the Blessed Virgin and Mother of God, Mary was established for all who wear this scapular.
The white scapular of the Holy Trinity: When Pope Innocent III approved of the order of the Trinitarians on January 28, 1198, an angel appeared to him, wearing a white garment on which was a cross formed of a blue horizontal bar and a red vertical bar. This garment became the habit of the Trinitarians, and eventually was the model for the scapular worn by the lay people who became members of the Confraternity of the Most Blessed Trinity.
The green scapular: In 1840, our Blessed Mother gave the green scapular of the Immaculate Heart of Mary to Sister Justine Bisqueyburu, a Daughter of Charity of St. Vincent de Paul. She belonged to the same community as St. Catherine Laboure, to whom our Blessed Mother had manifested the Miraculous Medal 10 years earlier. This green scapular has the image of the Immaculate Heart of Mary on one side, and the image of the Immaculate Heart itself, pierced by a sword, surrounded by the inscription, “Immaculate Heart of Mary, pray for us now and at the hour of our death.” This scapular can simply be blessed by a priest, and then worn, or placed in one’s clothing, on the bed, or in the room. Pope Pius IX approved the green scapular in 1863 and again in 1870.
Eventually, these smaller versions of the scapular became even more popular among the laity. To date, the Church has approved 18 different scapulars, distinguished by color, symbolism and devotion. Most scapulars still signify a person’s affiliation with a particular confraternity, at least loosely.