Maybe you're right about the pilot hat actually. I must think that over. The goggles however don't look so bad in my opinion. They somehow resembles shades
.
I was thinking of some kind of bandanna, cowboy hat or baseball hat but.. those didn't work as well.
About the sign. Well that's the point!
Those mutants feel so though and bad-ass that they don't give a damn about pissing of the others. In fact they could wear "F*** NCR" jacket, go directly to Shady Sands, look into some cop's eyes, and say "whatya starin' at, punk?" and they will still be ok with that.
How about my nightkin?