Bluebella Lingerie Valerian Open-back Brief. The perfect design to explore your provocative streak in, the Valerian open-back panty is a bold piece that lends a daring edge to your lingerie pairings. As the name suggests, this number features an Ouvert back, as well as eye-catching straps, gold-tone hardware, and a soft bamboo gusset for comfort. For a look that’s both unique and impactful, style the brief with the matching Valerian pieces.