There were several questions posted on the forum, asking about "Christmas Tree Order". One respondent said that there needs to be more research on the "use" of such language, and not from "the ramblings of veterans." I sent an email to the Royal Military Police Association (RMPA) and asked the Secretary of the RMPA Branch about the use of the term "Christmas Tree Order" and its wartime use among WWII Provost personnel in Northwest Europe, 1944-1945. This is the response I received:
"Mick: "Christmas tree order" was full brace webbing with ammunition pouches and white webbing belt, all blancoed. As far as I know, this was worn by Traffic Control Companies,and Provost Company members engaged temporarily on Traffic duty. Sincerely, Alan Walsh, Royal Miltary Police Association, West Yorkshire."
I further posted a link to a site (gleaned from WWII "slang" from 8th Army and Normandy veterans) about their use of the term "Christmas Tree Order" and found it listed prominently among other slang terms.