All items to Knight's Cross recipient Günter Zieger came directly of the family and are available on the market for the first time. All items ship with a scan of a personal declaration of his daughter dated 12.3.2023. Zieger was awarded the Knight's Cross on 8.2.1944 as an assault gunner. See https://www.tracesofwar.com/persons/80654/Zieger-G%C3%BCnter.htm for more details. 

Personal Heer Waffenrock "parade tunic" of Knight's Cross recipient Oberleutnant Günter Zieger (1919 - 1970). Zieger was awarded the Knight's Cross as an Assault Gunner on 8.2.1944. Typical design with dark green collar and cuffs. No pockets.

"Awarded while his assault gun battalion was attached to the 112. Infanterie-Division. Following fierce defensive action northeast of Bolchov, the division had to retreat to Karachev to avoid being overrun and destroyed. The attached assault guns succeeded in keeping the Soviet armoured spearheads at bay until the German infantry had successfully retreated and was ready for further action. Zieger and his company were particularly successful in these rearguard actions, and he was recognized appropriately."
Source: https://www.tracesofwar.com/persons/80654/Zieger-G%C3%BCnter.htm

Branch: Artillerie. Artillerie-Regiment 18

Shoulder boards: Sewn-in. Oberleutnant. Red color piping. Two rank pips as well as "18" numbers. The button of the right board was loose hiding inside a pocket. It was re-attached recently. 
Collar tabs: Red color. Period time machine-attached. No damage. 
Collar: Dark green. Red color piping.

Breast eagle: Hand-embroidered officer's pattern. Period time attached by hand.

Buttons: All buttons complete and period time attached.
Lining: Fine silk. Tailor's tag "H. Miltenberger Dresden". A 1939 dated name tag "Herr Fähnrich Zieger" to the inside of the pocket. 

Loops for several awards as well as a ribbon bar. He had worn a crew back Iron Cross 1st Class as you an see by a small hole and the shadow of the screw-back to the inside.
There are some threads left on the inside of the collar! He might have worn his Knight's Cross there as he certainly got some days off to present his Knight's Cross at the home front. After his visit, he simply ripped the ribbon off. 

Minor moth bites. Generally quite nice condition with some signs of wear and age.