Blue Green Diamond Print Sleeveless Top with Silver Neck Bar and Keyhole Neckline. Also has a silver button on the back. 
This is branded but I can't figure out what it says. It came from Target. Size is Small ~ Loose Fit. Measures more like a Medium or Large. Soft, Drapey, Scarf-Like Fabric. Retail $19.99

Bust 37"
Hips 41"
Length about 28" ~ varies because of the style