Steel Boned Waist Training Underbust Plus Size Waspie. This black waist training underbust corset is very individual and extremely sexy. Our black corset can define your shape beautifully when paired with a white skirt or vest top to enhance the bust. Steel boned. Plus size available. Use this Coupon & Get Extra 10% OFF on Steel Boned Waist Training Underbust Plus Size Waspie @FancyLadies.