For a truly ridiculous example of this, see this "Chaser's War On Everything" clip is which the same guy films a few different sites dressed as an American tourist, and later as a Saudi (in a thobe and gutra - had to look up the terms).

The security response is hilarious in how differently they react when the clothing changes.

https://www.youtube.com/watch?v=xxq4Y7QUdPA

(Bonus, watch the same clowns hire a limo + guys in suits jogging alongside and use that to get into a 'secure' conference site in the related video in the sidebar. Comedy gold.)