Wearing the Brown Scapular helps us to daily live our Consecration to the Immaculate Heart of Mary by imitating Our Lady’s virtues which will lead us to union with God. “Do whatever He tells you,” – Mother of Jesus (Jn 2:5)
On February 11, 1950, Pope Pius XII wrote:
“Christ is the way; Mary reflects the way; her Scapular is our keepsake on the way.”
“Therefore all Carmelites [including those who wear the Brown Scapular], … belong to the same Family of Our Most Blessed Mother and are attached to it by a special bond of love. May they all see in this Keepsake of the Virgin herself a Mirror of humility and purity; may they read in the very simplicity of the Garment a concise lesson in modesty and simplicity; above all, may they behold in this same Garment, which they wear day and night, the eloquently expressive symbol of their prayers for the divine assistance; finally, may it be to them a Sign of their Consecration to the Most Sacred heart of the Immaculate Virgin, a consecration which in recent times We have so strongly recommended.” Pope Pius XII, February 11, 1950
This website has information about making a personal consecration to the Immaculate Heart of Mary using three different methods: 33 Days to Morning Glory, St. Louis de Montfort, and St. Maximilian Kolbe.