Part of his regular attire is the Iron Cross, which granted existed before the Nazi party, but is now synonymous with the 3rd Reich.
Learn some history
While Iron Cross is asociated with Nazis, it predates and has survived post WW2 bans. Swastika which Zahra posted is mostly associated with Nazi stuff. Plus Zahra is nobody and was employed at the time, Lemmy was somebody who was not employed and longtime friend of HHH.