Very nice ribbed double layered black short sleeve crop top with cut out open back with string tie closer. Criss cross look when back string is tied.   One button at neck with a tear drop shape cutout between button and where the criss cross closure begins (see photos). 
 
Comes with extra button.
 
Measurements (close approximate):
Small
Pit to Pit:13 1/2"
Length from front middle: 14 3/4
 
Medium
Pit to Pit: 14 1/2
Length from front middle: 15"
 
Large
Pit to Pit: 15 1/2
Length from front middle: 15 1/4