Saint Simon Stock receiving instructions on the brown scapular from Mary.After you get your scapular, you must have it blessed by a priest. After it's been blessed, you then become "invested" when the priest recites certain prayers. Many scapulars do not require investment at all, but simply need to be blessed -- as do all scapular.
You only need to have your first scapular blessed; if it wears out and you need to replace it, the blessing "transfers" to replacements. (The proper way to get rid of worn out scapulars -- or any sacramental -- is to either burn it or bury it.)
It is good to remember that Jesus is the Lamb of God who takes away the sins of the world.
Wool comes from sheep and lambs are sheep.
Wool is uncomfortable to wear. Things that Jesus did for us were uncomfortable.
Mary is the 'spiritual' mother of all mankind watching over us and praying for us.
