[grey_whiskers]

Since you mentioned firearms, the suspense novel The Day of The Jackal had a bad guy pretending to be an wounded war veteran wearing a long greatcoat: he had one leg folded up behind him (like you do when stretching your quads) and walked on crutches. But his folded-up lower leg was hidden beneath his greatcoat, on which he proudly war his war medals.

[mass55th]

I was a Correction Officer for 25 years, and we always looked suspiciously at convicts who wore a heavy coat when it was hot out. Besides their state issued winter jacket, they were allowed to wear green Army fatigue jackets. We suspected they might be carrying a shiv, planning on making an attack, or were afraid of being attacked, and were wearing the coat to give themselves a bit of protection from being stabbed.