This is 20 inches pit to pit. A womens Medium a Mens S/M. This vintage Andrew St. John sweater vest made of 100% acrylic material. The brand "Andrew St. John" is associated with knitwear, and similar vintage pieces often date back to the 1970s, 1980s, or 1990s. This particular tag is associated with the 1980s. In great condition! Details include a classic V-neck design in a tan or beige color with cable-knit patterns running vertically down the front. The tag also mentions it is machine washable for easy care.