Waist Trainer Corset/Vest for Women Shape wear for Tummy Control Body Slimmer For Weight Loss Vanity Size - WAIST TRAINER RUN SMALLER THAN US SIZES. Please view the Chart. PLEASE MEASURE YOUR WAIST LINE TO DETERMINE THE CORRECT SIZE. Every body is different, please do not just go a size up while purchasing. 15% polyester 70% neoprene 15% nylon