http://www.ebay.com/itm/281399882985
This vintage style fair isle pullover sweater vest was made by Ralph Lauren as part of their now discontinued Rugby line. It is made of a linen and cotton blend.

Chest (pit to pit, unstretched): 20″ (doubled = 40″)
Chest (pit to pit, stretched): 24″ (doubled = 48″)
Length: 24-1/2″