Definition: The term vintage is used to describe clothing between 20 and 100* years old which is clearly representitive of the era in which it was produced. Vintage clothing can be used, new (from dead stock), manufactured, and handmade.
It is important to understand that the definition of vintage is fluid, so every decade brings forth new items as "vintage". It is also important to understand that all vintage will eventually become antique.
*Clothing 100 years old or more is classified as antique.