A waistcoat is a sleeveless garment worn over a shirt and under a jacket, typically as part of formal attire. It is often made from various fabrics, including wool, cotton, or silk, and can feature different patterns and colors. Waistcoats are commonly associated with men's fashion, especially in styles like suits and tuxedos. Originally designed to provide an extra layer of warmth, waistcoats have evolved into a stylish accessory. They can be worn for various occasions, from weddings to business meetings, and are sometimes referred to as vests in American English.