Zara Trafaluc One-piece Layered Light Blue and Brown Blouse

Zara trafaluc layered one-piece blouse. Under-layer is light blue cotton Top layer is a heavier fabric and is brown with a small blue stripe Top is marked Medium but probably fits like a x-small. I am listing it as an XS It measures 15.5” across bust. Would fit a 31 inch bust Side zipper Small button loop closure at neck. Could be worn with back tied or with long tails. Purchased but did not fit. Totally bummed me out. 😔 Non-smoking home