>>18514332 (OP)
Depends, tame office workers, or arrogant artsy types?
For the tamefags, milsurp and metal / punk graphic tshirts work. Actually got the cops called on me once bcs. some fag thought I was following him - fucker didn't know I lived 500m further on the same road.
With artfags, I'd guess anything prim, proper, and rightwing should work. Neofolk, basically. Anything really provocative, they'd consider personal expression, but wear a clean, well-fit pair of jeans, combat boots and a leather jacket while being bald, and they'll consider you a second hitler.
Also, open carrying weapons is always nice. Just make sure you check the laws first, and you can get away with a lot. For example, German law permits carrying flintlocks everywhere, including schools, so guess who brought a rifle to graduation for the lulz?