Effect of Mage Armor [1st Level Abjuration]

If willing and unarmored, equipping this buff represents the effect of a Mage Armor spell, providing a protective magical aura for the duration of the spell. Your base AC becomes 13 + DEX. The spell ends if you don armor, dismiss the spell as an action, or wait for 8 hours to elapse - such as after a long rest. At this point you must unequip the buff.

Mage armor is no ordinary chain shirt -  the mage's armored aura has links made of the Weave itself! It's appearance to the untrained eye, if any, depends synergistically on caster, target, and surrounding environment combined.

[Homebrew Details]
Basic Information: 
 Rarity=Uncommon
 Base_Item_Type=Armor
 Base_Armor=Chain_Shirt
 Dex_Bonus=Full_Modifier
 STR_Requirement=1
 Stealth_Check=None
Additional Information: 
 Weight=0.00
Modifiers: 
 Proficiency.Self

Made of interlocking metal rings, a chain shirt is worn between layers of clothing or leather. This armor offers modest protection to the wearer's upper body and allows the sound of the rings rubbing against one another to be muffled by outer layers.

Notes: Proficiency: Self, This item is intended for use with the Mage Armor spell. It modifies a Chain Shirt to provide the effects of Mage Armor, giving a weightless armor with an AC of 13+MAX_DEX, proficiency, and no disadvantages to stealth or other abilities, Buff