It says XS, but it's a pretty loose fit, so even I, who usually wear L, wore it baggy. It might even be a dress. No pets, no smokers. This short-sleeved T-shirt features a distinctive gray and blue color scheme and is comfortable to wear thanks to its rayon and spandex material. - Brand: MARC BY MARC JACOBS - Size: XS/S - Color: Gray/Blue - Material: Rayon/Spandex - Washing Instructions: Dry clean only Thank you for looking.