Hi, and welcome to the forum!
Nothing Third Reich era.
I will move this to the Imperial German section to see if anyone recognises them there.
No idea about the aiguillettes, but the cuffs would more appear to be pocket flaps to a ceremonial uniform, but not a military one. I am thinking for an official, like police , customs, a mayor or anything else then military. Probably German indeed...
Always looking for Belgian Congo stuff!