Formal trousers are designed for formal settings like business meetings and events, usually in neutral colours, made from high-quality materials, well-tailored with features like pleats and cuffs. They're worn with dress shirts and formal shoes, often with a jacket or blazer. Leisure trousers, or casual pants, are for comfort and informal occasions. They vary from jeans to sweatpants, made from diverse materials, and come in different colours and patterns. Their fit ranges from loose to slim, usually worn with casual shoes and shirts.