AITO builds the ZIPPER from a single material in two states. The outer body and sleeves use a heavyweight ribbed cotton knit — dense enough to create micro-shadows across the surface. The smooth cotton panel at the center placket, sides, and collar carries a flat, slightly brushed quality. Against the monochrome black, the effect is tonal: shadow and surface held together in one silhouette. A full-length zipper runs from hem to the top of the tall stand collar. The fit falls clean from shoulder to hip, structured enough to read as outerwear, relaxed enough for easy movement underneath.