Thistle and Spire Mullberry Keyhole Bralette in Black. - size XS (also in L) Thistle and Spire Mullberry Keyhole Bralette in Black. - size XS (also in L) Self: 100% nylonMesh: 90% nylon 10% spandex. Hand wash cold. Back hook and eye closure. Adjustable shoulder straps. Sheer mesh fabric. Item not sold as a set. Imported. TIRR-WI92. 191235. Proudly female founded, Thistle and Spire's show-stopping designs are created to make you feel your most fearless self. Based in New York City, Thistle and Spire draws inspiration from the architectural details of the Manhattan skyline and the trailblazing people who wear their pieces. Their custom embroideries, sultry cutouts and intricate strapping details are not for the faint hearted. Set the tone for your day with lingerie.