When using a Command Block to summon an Armor Stand with armor already on it, the Armor isn't there. The armor stand and its custom name shows perfectly fine, however.

The command, from the command block:
/summon Armor_Stand ~ ~1 ~ {ShowArms:1,CustomName:Elf,CustomNameVisible:1,ArmorItems:[

{id:leather_boots}

,

{id:leather_chestplate}

,

{id:leather_leggings}

,

{id:leather_boots}

]}