WON HUNDRED poplin mandarin collar button up

Cotton poplin button-up. Modern, mandarin collar. Rounded edge. Collar is slightly fraying as pictured. Slightly longer length in back— about 0.5” longer in back. Loose-fitting, oversized. I purchased at a designer consignment— unsure of the size. The care label says “34”. For women’s sizes I would say size M. I’m a size 2-4 and wear this without a problem though. It seems like a Men’s shirt though... I’d guess it was a Men’s Small.