Luftwaffe paratrooper (Fallschirmjäger) jumping smock. A so-called "Knochensack". Smock were made with green cloth as well as cloth showing a camo print. Tan & water camo, as well as splinter camo patterns, were issued. This example comes with s splinter camo pattern printed to the cloth. A rather late war issued example. 

Zippers: All zippers are fully working. Attached by the factory.
Top zippers: RAPID marked
Horizontal front zippers: RAPID marked

Front buttons: Blue glass buttons. Period time attached by the factory.
Press buttons: All fully working. PRYM 6 marked.
Pistol holster buttons: Period time attached by the factory.

Breast eagle: Machine-embroidered EM/NCO type. Correct type with green backing. Period time maschine-attached by the factory.

Lining:
Sleeve lining: Fine silk
Inner lining: Fine silk as well as linen. Pockets from linen. Armpits from Italian camo material and German splinter camo cloth

Markings: Size stamped. Stamped with the "Reichsbetriebsnummer"

An excellent textbook example in unworn condition 1. Extremely hard to upgrade.