shoes
for many years I used to always wear Birkies when flying.
Everytime when boarding at LHR or GTW I would have to take them off and put them through the scanner. Iwas at a loss as to how I could hide explosive in a pair of Bairkie.
Eventually I got fed up wih this (along with 'always' getting taken aside to have my bag swabbed (every single outbound flight for the last 4 years - why me?)) and started wearing those rubbery 'all-terraine' sandals.
Since then I've never had to take them off (still getting swabbed though).
Finally, what is the purpose of taking the belt out out your trousers?