Pvc Underbust Corset Black PVC Locking Steel Boned Underbust Corset Dotty After Midnight Plus Size PVC Steel Boned Corset CS 426 Orchard Corset Pvc Underbust Corset Handmade Black PVC Corset: Steel Boned Underbust Waist Cincher Etsy Black PVC Underbust with halter strap women corset. This is a glossy black patent PVC underbust corset with a front zip closure and serious structure built in. You walk in cinched, and the whole room feels it before you say a word. Twelve steel bones, four static in the back and four static in the front with eight spiral bones running through the body, hold their shape through every move you make. The kind of piece you plan a night around.