Butterick 7500; ca. 1955; Quick N Easy One Piece Wrap Dress. Here's the smartest idea of the year... a dress that wraps from back to front for sheath-and-overskirt look. Binding finishes the edges. It's the most comfortable dress you've ever owned.
From the style, age and pattern description, it appears that this is another "incarnation" of the highly sought after "walk away dress" Butterick 6015.