Who told you that?
A “vision of Mary” promised it:
“The Blessed Virgin of Mount Carmel has promised to save those who wear the scapular from the fires of hell; She will also shorten their stay in purgatory if they should pass from this world still owing some debt of punishment.
This promise is found in a Bull of Pope John XXII. The Blessed Virgin appeared to him and, speaking of those who wear the Brown Scapular, said, “I, the Mother of Grace, shall descend on the Saturday after their death and whomsoever I shall find in purgatory I shall free so that I may lead them to the holy mountain of life everlasting.””
http://www.sistersofcarmel.com/brown-scapular-information.php
Seriously...a third article on this topic in the past two weeks??