Up for sale is an SMWholsale Erbsenmuster Winter Parka in size Medium (40-42 Inch Chest). I even tried on after wearing multiple layers (Tunic, Sweater, Service Shirt) to see if it'll fit better but was still extremely roomy.
Definitely can be used as a Large if you don't want a Parka to be too baggy. I'm 5'11 and the sleeves nearly covered up to the tips of my fingers. This Parka came with the pressed, black buttons instead of the pebble. White pressed buttons on the reversible white side. Ask any questions before purchasing.