Taz,Dave, Acer and Dan,
Somehow this all began to sound familiar! I checked my 1964 Harleyford publication, von Richthofen and The Flying Circus and this is what I found:
" Inspection of photos of some Dr 1s show a vertical streaky effect on the sides of the fuselage and top surfaces,this being the original finish of grey/green and brown with the under surface of light blue before the hexagonal pattern cmouflage was introduced."
Perhaps the oft maligned Nowarra was closer than we thought!
RAGIII