Officer's had two types of shoulder insignia...those sewn into the shoulder seam and the removable type. Early in the war, when it was found that the bright prewar straps were leading to officers being targeted, several forms of covering were used. The most common was a strip of cloth sewn over the board. Officers also painted their boards field gray and before the September 1915 regulations, a type of "subdued" board was available. By the September 1915 regulations, officer's boards were either subdued flat gray Feldachselstücke or the bright Friedensachselstücke, primarily meant for the Friedensuniform and the Kleiner Rock. So, from the very early days of the war, there was no need for an officer to remove his sewn-in boards, as there were several means to hide them.
Chip