Striped short sleeve button-up from Uniqlo. Size small but quite boxy and fits a medium too IMHO. Only worn a few times. Very good condition. No major flaws. I just don't wear this enough. 45% rayon, 33% linen, 22% cotton See https://www.uniqlo.com/au/en/products/E458284-000?colorCode=COL55&sizeCode=SMA001 for more details