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. Buy this and you can Save 10% OFF Steel Boned Waist Training Underbust Plus Size Waspie@fancyladies.com.