If you want to spawn a Mob for example with armor with a commandblock, the mob spawns with anything.

One Example:
/summon Zombie ~ ~1 ~ {DropChances:[0f,0f,0f,0f,0f],Eq­uipment:[

{id:267,Count:1}

,

{id:301,Count:­1}

,

{id:300,Count:1}

,

{id:299,Count:1}

,]­}

The Zombie has nothing in its hands and no armor. --> screenshot