White crop top with open scallop back

The details on this white crop top are stand-out. - White crop top, worn only 1-2 times - 'Open' back with scallop edges - Cut out sleeves - Material unknown but feels like a heavier poly blend - Boxy fit - Shoulder to hem : 16 inches - armpit to armpit: 16.5 inches - Size unknown but would guess its a S-M *Tiny stain near left armpit which is not visible when top is worn.