the blue uniform was for all KM personell regardless of service entry and even duty. the uniform to be worn as per marine was the field grey. a close friend locally served in the defense of Kiel for several years in a 8.8cm flak batterie and he wore the field grey while dutied with the Flak piece he then was absorbed into a marine feld division in Finland with some of the bloodiest fighting with the Soviets.

in his photo collection he shown wearing the KM blues early on and then when stationed to flak and in the Feld unit he is wearing the field grey sporting his EK 2 and his Flak badge.

hope this makes some sense to you