Sur coats, also known as overcoats or outercoats, are outerwear garments worn over clothing to provide warmth and protection from the elements. Other synonyms for sur coats include topcoats, greatcoats, and trench coats. Topcoats typically refer to dressier versions of sur coats made from fine wool or cashmere, while greatcoats are thicker and heavier winter coats made from wool or wool-blend materials. Trench coats are a type of lightweight waterproof sur coat that typically extends to or below the knee and has a waist belt. Overall, the term sur coat is a broad term that encompasses various styles and materials of outerwear, each with their own unique features and purposes.