No size tag, PLEASE see approximate measurements. Estimated to be small. 28-29 inches chest (14.5 inches pit to pit) — this has 3 levels of binding clasps to fit to 28 -29 inches — has some stretch Approximately 15.5 inches from top to bottom (front side) Has clear shoulder straps that can be removed. Mesh fabric behind the lace up front. - it doesn't really open if unlaced because of the mesh.