A military uniform was a type of uniform which was worn by members of military forces.
While working for Torchwood Three, (TV: Children of Earth: Day Four et al.) Captain Jack Harkness wore what Owen Harper described as a "military uniform", which featured a coat. (TV: Fragments) His attire would earn him the nickname "World War II" from Rex Matheson. (TV: Rendition et al.) He did not always wear it in full though, something Bilis Manger noted when encountering Jack in 1940s war-time Britain. Jack, having came there by accident, lied that he was on leave for 48 hours. (TV: Captain Jack Harkness)