Sounds like a set of "Cloak Powers" with Summon as an Alternate Effect.
Really Awesome Cloak: (4 pp per mode, 5 pp total)
Alternate Effect: Living Cloak
This means you'd get the benefits of the magic cloak while wearing it, and lose those powers when you told it to do things on its own.
This uses Flight and Protection to provide flight and protection, and the Alternate Effect extra (http://www.d20herosrd.com/6-powers/modifiers/) to replace them with the Summon power so you can have your cloak become an independent creature (http://www.d20herosrd.com/6-powers/e...ummon-control/) at the cost of losing the flight and protection. You'd have to build the Cloak as a character, it'd be Power Level 2 like you and have 30 Power Points to spend. Unlike you though it'd be a Minion, meaning it would be much easier to defeat in combat.