Denim Short-Sleeve Button-Up Shirt in Lunar Wash. XS A button-up shirt that's as easy as your favorite tee. Made of lightweight denim in our fan-favorite black wash, it's a wear-every-day, all-year-round kind of deal. Regular fit. Body length from high point of shoulder: 23 1/2". Cotton. Do Well: We partner with the Better Cotton Initiative to improve cotton farming globally. Machine wash. Import.