Q. How should the Scapular be worn?
A. The Scapular must be worn over the shoulders in such a manner that one part hangs in
front of the body and the other in back. Worn in any other way, it carries no indulgence or
promise. It is not necessary to wear the Scapular next to the skin. Many Catholics may not
know it is the wish of the Holy Father that the Scapular Medal should not be worn in place of
the cloth Scapular without sufficient reason. Mary cannot be pleased with anyone who
substitutes … [More]

TES, I hope this helps explain a bit more, what the Brown Scapular is...Also, check out: http://www.freebrownscapular.com/brown_scapular_history.html

The Brown Scapular:
The Thirteenth Century was a turbulent time and the Church was threatened by enemies on all sides. It was then that the Blessed Virgin Mary appeared to St. Simon Stock, Superior General of the Carmelite Order, on July 16, 1251, and in her hand she held the Brown Scapular, and She gave this promise:

"Take this Scapular, it shall be a Sign of Salvation, a Protection in Danger and a Pledge of Peace. Whosoever dies wearing this Scapular shall not suffer eternal fire." - Promise … [More]