It seems all too common for "historical works to be filled with grevious errors.
For example, the often quoted "Doctors in Gray." On page 23 the author "quotes" Army reglautions describing the Confederate medical officers uniform including a cap with the letters "M.S." embroidered in gold on the front of the cap. The author clearly never read a copy of the Confederate Army uniform regulations because nowhere does it mention such cap device. Yet hundred of people buy the book and read what it says and takes the written word to be fact. And still other "researchers," not content with primary source research rely on Mr. Cunningham's "expert research" and list him as the source for their research. And before long everyone is writing the same thing.
I would think that for armies which kept track of every single item which was issued to the troops, for the apron, which "popular immagination" has come to look to as a required item for ever medical officer attending to the kool-aid man, there would be at least some reference in official papers, requistions, etc as to this item being provided to hopsitals or regimental medical staffs.
Medical Director Bee's Brigade - 150th First Manassas
Medical Director Evans' Brigade - 150th Leesburg
Medical Director Valley District - 150th McDowell
Chief Surgeon of Division - 150th Seven Pines/Seven Days
Chief Surgeon of Division - 150th Sharpsburg
Chief Surgeon Heth's Division - 150th Gettysburg