Right...just like the FBI could catch more if they knock on the door and say "prize patrol"
I like how is reality different from movies in this case; cia agents are often recruited from locals and wear basic regular clothes. Cia agent somewhere in middle east can look exactly like some local farmer or taliban solder. Or even can be taliban solder.
They are doing a good job no matter what they are wearing. It's a tough job, one that most of us shy away from.