A peacoat is a type of heavy-duty, waterproof coat that was originally designed for sailors in the 18th century. The name comes from the fact that it was first issued to officers in the Royal Navy as their “greatcoat.” It has since become popular among civilians and is often associated with classic style and sophistication. Peacoats are typically made of wool or a blend of wools, and feature a double-breasted button front, shoulder straps that can be fastened to form a high collar, and large lapels. They also have a distinctive shawl collar that folds back to cover the shoulders when it rains.