The tag says it's a size US 40M and UK 40J Feel supported in complete style. Crafted with irresistible stretch lace and sheer lining for a lighter look. Designed for a petite silhouette and fuller bust with shorter wires and center pull straps for narrow shoulders. Designed for a fuller bust with shorter wires and straps positioned to suit narrow shoulders Side support for forward shape Stretch lace top cups with sheer lining for a lighter look Moveable J-hook fastening allows the straps to be converted into a racerback style Sweet keyhole cut-out and bow detail at the center front