Terms such as "M40" and "M43" were never designated by the Wehrmacht, but are names given to the different versions of the Modell 1936 field tunic by modern collectors, to discern between variations as the "M36" was steadily simplified and tweaked due to production time problems and combat experience. The term "tunic" is likewise incorrect and something applied by modern collectors to all forms of military clothing. In German it is a Feldbluse, or Field Blouse, and not a "tunic".[citation needed]