The COSTUMAKERS Outerwear One Way Separating Zipper in Black, 50 cm (20"), uses #5 nickel metal teeth to provide a durable, smooth‑running closure for coats and jackets. The one‑way separating design fully opens at the hem for easy dressing and ventilation, while the drop pull offers comfortable handling with gloves or layered garments. Interface the placket, baste to confirm alignment at hem and collar, and topstitch evenly for a professional finish. Pair with coordinating thread for a blended look or a slightly contrasting tone for visible topstitching on the placket.