I cannot find the size tag but I would say a small. Measurements flat-Small-Chest=18", waist=15.5", Hips=18" Has tags but looks like it has been worn before. It is in good condition. Your best done-in-one look from Boyish, featured in a classic button-up silhouette with a slim fit and statement puffed sleeve detailing. 60% cotton, 40% tencel, Front button closure, Detachable waist tie, Side seam and back slip pockets, Breast pockets, Puff sleeves.