Indeed, as happened in the early period of the Wehrmacht, that is peculiar.
For enlisted men - most often - in the whole 1935 and the start of 1936er.
*** He wear M.21 feldmuetze, new M.33 feldbluse with brustadler and etc.:
Here is another example of the "old" cap in wear by a soldier of the "new" army:
NEC SOLI CEDIT
Nice bavarian officer of the early Reichswehr.
Bidding starts at 2 euros:
H935 Foto Wehrmacht Reichswehr Offizier mit Feldbinde Koppelschloss Bayern WK1 | eBay