I believe that this bra dates from the 1990’s when Wonderbra was first introduced to the US as a pushup brand. They had long since been available in Canada and the UK in a range of styles. The three-section cut and sewn underwire cups are lightly padded with fibefill and have pockets for pushup pads (not shown). The open or “gate back” style was a feature of Wonderbras at the time. The shoulder straps detach in the back so they can be worn crossed style.