Size OS-. It's this shirt, see their website for more sizing info: https://www.nettlestudios.com/collections/circus-tent-summer-drop/products/sour-cherry-dot-tulip-top Beautiful hot pink polka dot cotton shirt! Like new, I wore it once and didn't like the shape on me. So fun, comfy and breathable for summer. Offers and questions welcome. From a nonsmoking cat friendly home.