"Cocktail" attire is the most common and often most confusing code. It sits between "Smart Casual" and "Formal." For men, a suit is expected, but it doesn't have to be a dark business suit. You can experiment with textures, lighter colours (like light grey or blue), and patterns. A tie is recommended but not strictly mandatory if you wear a crisp, high-collared shirt and a pocket square. Jeans are generally not appropriate for Cocktail attire.