Shapewear garment, specifically a waist trainer belt. Shapewear is designed to temporarily alter the wearer's body shape, providing a slimming effect and smoothing lines under clothing. Waist trainers, like the one shown, focus on compressing the midsection. They are often made from high-tech fabrics that pull in and support the body. Some people wear shapewear daily, while others use it for special occasions. It is put on before getting dressed to ensure it stays in place. While shapewear can create a slimmer appearance, it does not lead to long-term fat reduction.