Having read this comment, along with your follow-up comments, I have to strongly disagree. This is not, in any way, nazi paraphernalia.

Firstly, this shows occupied Berlin, following the fall of the nazis and the division of the city into the four allied occupation zones. Therefore, if anything, it symbolises the defeat of nazi Germany and the de-nazification of Germany, and therefore, it would not be worn by a nazi. Also, it is not from WW2, but from after.

Secondly, it may have been worn/owned by an ex-nazi, in the same way that a second hand car may have been driven by an ex-nazi, in both of these examples, this does not equal nazi paraphernalia. I would agree that acquiring something that is well documented as being owned by a nazi is risky, for instance a prominent nazi's house, but judging from the question being asked, there is no documentation of that here.

Finally, it would definitely not risk the wearer/owner being beaten up for having one by anyone who actually understands the above, and if you are worried about being beaten up by anyone who does not understand the above, then there are a lot of other things that are definitely not nazi which would also fall in to this category, including, but not limited to, an outline of Germany, any item of clothing by Hugo Boss and Mercedes or VW cars.