Authentic Off-White Main Label Virgil Abloh 2013 runway collection shirt

Unique piece from Off White 2013 runway collection. The bottom can be totally zipped off. I cannot get the zipper to go all the way around. I don’t know if there’s a piece missing or if I just haven’t figured it out purchased from a charity clothing auction. Impeccable details, features and external owners label on the sleeve engraved buttons and made in Italy tags. I think this is a men’s top, but could also be worn unisex as a woman’s oversized large