EUC Womens Zara Black And White Floral Blouse

This shirt was I just purchased. It doesn't fit me. It does not have any tags but I did buy from orginal owner who said she bought it at Zara. I only have her word and I bought it believing her. This is a beautiful floral blouse ! It has a functional zipper in the back 6 " long. It looks like a small/ medium to me. Approx : 21" Length Approx : 27 " Pit to Pit