+1 Breastplate is a common Medium Armour.
Wearing this "plus one" garment allows you to bring one additional person to a wedding or any other similar occasion.
Properties
14
Armour Class + Dexterity modifier (max +2)
Medium Armour 
Required Proficiency: Medium Armour
Rarity: Common
Weight: 9 kg / 18 lb
Price: 100 gp
Where to find
Won as a consolation prize from Akabi's Wheel of Fortune, Circus of the Last DaysX: -68 Y: -73.