The velvet rope? Breeze past it. The secret door? You've got the password. Backstage? You don't even need a pass. This gorgeous sheer Parisian thong from Simone Perele, with its fabulous abstract botanical embroidery, mermaid-scalloped edging at the hips, and awesome Chanel-throwback quilting opens all doors, either backstage Koonsing at the Met or backstage at Glasslands. Come right this way.