M36 Feldbluse?

[Eddie]

Hi guys, any thoughts on the cut of this Feldbluse? It looks a little odd to me? I'm hoping that it's a Heer Feldbluse, but, it looks a little strange to me. I don't see a place for where the collar tabs rested either.
Inner stamp reads "Hersteller: Alois Heiss KG".
Obviously worn post war with the bakelite buttons however.

[Eddie]

I'm confused by the presence of only 4 buttons, which you see sometimes on DAK or Luftwaffe Feldbluse, it also seems to be tailormade piece is some details. I would think perhaps it's postwar, but, the beltholes make me think TR period. Does anyone have any thoughts?