The Scapular devotion dates from the time of the prophet Elias (Third Book of Kings). The people were then adoring Baal (the devil). To bring the people back to God, Elias prayed for a drought, which the people would understand as a sign of Divine displeasure. After it did not rain for three and a half years, Elias went up to Mount Carmel (in Palestine) and asked God to send rain. After praying for a time, he sent his companion to see if rain was coming.
...coming from the Church herself