I WAS wearing the cap.
I murmured something along the lines of: walking around here for hours looking for someone.
Finally the guy is waiting for me in the first class lounge.
He wanted to see a first boarding pass, which I showed him, (first means longhaul and passport required).
I only had an ID card to show him, but told him that I have someone that is flying in to bring my passport.
I told him that I anyway won't get on the flight without passport, so there is nothing to worry about.
I was allowed to pass.
THE END