It was what Catholics would refer to as an "Enrollment in the Brown Scapular."
Today, the western Church celebrates the Feast of Our Lady of Mount Carmel. It is one of the most popular feasts in honor of the Blessed Mother, if only for its association with the Brown Scapular.
In its original form, a "scapular" is a tunic-like garment worn over the habit of male or female members of religious orders. In its more popular form, it is two small pieces of cloth connected by two cords, worn over the neck.
The so-called “Brown Scapular” identified with the Carmelite Order and their traditional brown apparel, originated in the appearance of the Blessed Mother to Saint Simon Stock in 1251. She is said to have told him, upon granting him the Scapular:
“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.”
Of course, this does not make the Brown Scapular some sort of magic talisman, which would amount to superstition, and thus objectively sinful in practice. The "Sabbatine Privilege" associated with wearing the Brown Scapular requires that the person: 1) Wear the Brown Scapular continuously, 2) Observe chastity according to one’s state in life (married/single/whatever), 3) Recite daily the Little Office of the Blessed Virgin, OR observe the fasts of the Church together with abstaining from meat on Wednesdays and Saturdays, OR with permission of a priest, say five decades of Our Lady’s Most Holy Rosary OR With permission of a priest, substitute some other good work.
Pope Benedict XV also said you could knock 500 days off Purgatory if you kissed it, devoutly (if you're into that sort of thing).
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Also popular (and arguably more common) is the wearing of the "scapular medal." This is a small medal worn in lieu of the Brown Scapular, although not really a replacement. The minimum requirements, laid down by Pope Saint Pius X in 1910, is that the medal must "show the image of Our Most Holy Redeemer, Jesus Christ, showing His Sacred Heart, and the obverse that of the Most Blessed Virgin Mary." Most of them have a rather common appearance, but yours truly found a remarkably uncommon choice on eBay, and wears it faithfully.
The devotion remains popular today, as a new generation of Catholics discover tradition. One can spot a Catholic "kickin' it old skool" from across a crowded room, bearing the telltale sign around their neck that peers out from underneath the neckline of their clothing. More information about the Brown Scapular, the devotion attached to it, and the ceremony for its reception (which is how yours truly got his as a fourth grader in the spring of 1965) can be found here.
Of course, once you are enrolled, you don't have to enroll again, nor does your Scapular have to be blessed. This writer started wearing his again only recently, and didn't have to do anything once it was worn. (See above.)
Devotion to this title of Our Lady takes other forms in Italian communities throughout North America. Most notable is the annual patronal celebration of Our Lady of Mount Carmel, a 125-year-old parish located in the Williamsburg section of Brooklyn, New York. Every year at this time, a giant tower topped by an image of Saint Paulinus of Nola is carried aloft in procession on a giant platform, accompanied by a brass band. For the boys of the parish who participate in carrying the statue, this event symbolizes a manly rite of passage.
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Meanwhile, elsewhere in the Catholic world, we remember Saint Marie-Madeleine (baptismal name Julie) Postel, born in France in 1756. Entering into religious life under Franciscan rule, she went on to found the Sisters of Christian Schools. During the French Revolution and the subsequent Reign of Terror, not only did she hide fugative priests at the risk of her own life, but was charged with carrying the Holy Eucharist to others in hiding at the direction of her bishop. Such measures have long been common during times of persecution, and was the original intention of Extraordinary Ministers of Holy Communion, as opposed to ... well, you know.