Genuine Belgian army field jacket military BDU olive shirt military combat NEWThe vintage Original Belgium military BDU (Battle Dress Uniform) jacket is a type of military uniform jacket that was worn by Belgian soldiers. It is olive in color, and is considered to be "vintage" which means that it is a older version, possibly used in past. It is likely made of durable materials such as cotton and polyester, and may feature pockets and other functional design elements typical of BDU jackets.