Used Mary Jane Sz S Peplum Sleeveless Dressy Top

Used Mary Jane Sz Small Peplum Sleeveless Dressy Top in Black, White, and Navy. Features a crew necklace and no closures. Purchased from another posher and though the top is is great condition, the label is completely washed off and I’m not able to see what material or size it is. However, it feels like polyester or polyester/spandex blend (it’s a little stretchy), while the fit seems to me like a Small or 4/6.