Kora Rae Black Bodycon Mini Dress with Mesh Back and Cut Out Sides Medium

Kora Rae Black Bodycon Mini Dress with Mesh Back and Cut Out Sides Nylon/Polyurethane/Polyester It is marked size Medium but it seems small. Please compare measurements. Lying flat it measures 16" across under the arms, 13" across the waist and 22" long from the waist to the hem.