Dean's Leather Jacket has become an iconic part of the character. Before it belonged to Dean Winchester, it belonged to John Winchester - so there's no telling how old the leather is, how many battles the jacket has actually seen – it is well worn and beautiful. Dean wears it whenever he knows there’s no danger of it getting ruined. It’s really Dean’s superhero signature look.
Dean's Leather Jacket appears to be a Wilsons Leather/M.Julian.
not just a wilson's jacket, this stated on http://www.supernaturalwiki.com
Sorry the flash was on in the photos
