While the exact brand and model of the jacket have never been officially confirmed, it's widely believed to be a vintage jacket, possibly from the 1970s or 1980s.
Important Note: While many fans search for a replica of Dean's jacket, finding an exact match is almost impossible. The jacket used in the show has undergone many modifications and alterations over the years, making it unique.
However, if you're looking for something similar, you can try searching for "vintage brown leather bomber jacket with fur collar" or "Dean Winchester jacket replica".
You can also find information on websites and forums dedicated to Supernatural fans, where they often discuss and share their knowledge about the show's props and costumes.