Vintage children's nylon vest.  Made in England, in the late 1960s or early 1970s, but never used (unsold shop stock).  

Machine washable.

Marked as age 12-14, but children were smaller in those days, so please check the measurements are right for what you need.  It looks quite small for a 14 year old.

Chest measurement is 20 inches unstretched, 30 inches fully stretched.  

Shoulder to hem measurement is 25 inches (this is a bit longer than most modern vests).

Condition: Vintage clothing, about half a century old, but never used and still in perfect condition.   Please remember that this is an old garment, and is not likely to last long in normal use, though it might be ideal as part of a genuine 1970s costume or display.