Narrow tinsel ribbon band choker
OR
earrings
OR 
a set of both,
with silver-colored metal and black resin bat cameos.

Choker is on a black tinsel ribbon. it has a 2" long adjuster chain in back, and adjusts between 15 to 17" around, which is several inches larger than most chokers. 
if you're thinner, it'll just hang down, like it does on the mannequin in the pics, though the ribbon may occasionally flip inside out. 

earrings are leverbacks for traditionally pierced ears, or for threading through small tunnels. 

the pendant on both is about 1.5" tall, and a little under 1" wide.