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 suits and are a staple in men's fashion, although they can also be worn by women. Originally designed to provide warmth and style, waistcoats have evolved over time. They are often buttoned down the front and may have pockets. In modern fashion, waistcoats can be worn for both formal occasions and casual settings, adding a touch of sophistication to an outfit.