Spanx Women's Seamless Medium Control Leggings - XL - Black - Available at M&S

The Seamless leggings from SPANX combine a sleek shape with comfortable support. A double-layer waistband works to smooth the tummy for a flattering fit, while a twill knit construction sculpts your silhouette. These leggings are crafted from soft fabric with four-way stretch that moves when you do.